Effect of icosahedral clusters on β-relaxations in metallic glasses
The most pronounced β-relaxation was found in the Y-based binary metallic glasses (MGs). The correlation between β-relaxation and local atomic structure was studied. The dynamic mechanical measurements were performed for three chosen binary systems:Zr-, Ti-, and Y-based MGs. The experimental results show that, in each system,the larger negative enthalpy of mixing (ΔHm) between the component elements makes β-relaxation become more pronounced. The less negative value of ΔHm facilitates the formation of icosahedral clusters, which have a pinning effect on the excitation of β-relaxations and correspondingly make the β-relaxation become less pronounced. These chemical effects on β-relaxations can only be compared in the same MG system, and it is not suitable for the comparison between different systems due to the different features of the major metallic elements.
LaGa-based bulk metallic glasses
We report the formation of LaGa-based bulk metallic glasses. Ternary La-Ga-Cu glassy rods of 2-3 mm in diameter can be easily formed in a wide composition range by the conventional copper mold casting method. With minor addition of extra elements such as Co, Ni, Fe, Nb, Y, and Zr, the critical diameter of the full glassy rods of the La-Ga-Cu matrix can be markedly enhanced to at least 5 mm. The characteristics and properties of these new LaGa-based bulk metallic glasses with excellent glass formation ability and low glass transition temperature are model systems for fundamental issues investigation and could have some potential applications in micromachining field.
Granular packing as model glass formers
Static granular packings are model hard-sphere glass formers. The nature of glass transition has remained a hotly debated issue. We review recent experimental progresses in using granular materials to study glass transitions. We focus on the growth of glass order with five-fold symmetry in granular packings and relate the findings to both geometric frustration and random first-order phase transition theories.
Five-fold local symmetry in metallic liquids and glasses
The structure of metallic glasses has been a long-standing mystery. Owing to the disordered nature of atomic structures in metallic glasses, it is a great challenge to find a simple structural description, such as periodicity for crystals, for establishing the structure-property relationship in amorphous materials. In this paper, we briefly review the recent developments of the five-fold local symmetry in metallic liquids and glasses and the understanding of the structure-property relationship based on this parameter. Experimental evidence demonstrates that five-fold local symmetry is found to be general in metallic liquids and glasses. Comprehensive molecular dynamics simulations show that the temperature evolution of five-fold local symmetry reflects the structural evolution in glass transition in cooling process, and the structure-property relationship such as relaxation dynamics, dynamic crossover phenomena, glass transition, and mechanical deformation in metallic liquids and glasses can be well understood base on the simple and general structure parameter of five-fold local symmetry.
Interstitialcy theory of condensed matter states and its application to non-crystalline metallic materials
A comprehensive review of a novel promising framework for the understanding of non-crystalline metallic materials, i.e., interstitialcy theory of condensed matter states (ITCM), is presented. The background of the ITCM and its basic results for equilibrium/supercooled liquids and glasses are given. It is emphasized that the ITCM provides a new consistent, clear, and testable approach, which uncovers the generic relationship between the properties of the maternal crystal, equilibrium/supercooled liquid and glass obtained by melt quenching.
Secondary relaxation and dynamic heterogeneity in metallic glasses: A brief review
Understanding mechanical relaxation, such as primary (α) and secondary (β) relaxation, is key to unravel the intertwined relation between the atomic dynamics and non-equilibrium thermodynamics in metallic glasses. At a fundamental level, relaxation, plastic deformation, glass transition, and crystallization of metallic glasses are intimately linked to each other, which can be related to atomic packing, inter-atomic diffusion, and cooperative atom movement. Conceptually, β relaxation is usually associated with structural heterogeneities intrinsic to metallic glasses. However, the details of such structural heterogeneities, being masked by the meta-stable disordered long-range structure, are yet to be understood. In this paper, we briefly review the recent experimental and simulation results that were attempted to elucidate structural heterogeneities in metallic glasses within the framework of β relaxation. In particular, we will discuss the correlation among β relaxation, structural heterogeneity, and mechanical properties of metallic glasses.
Multiscale structures and phase transitions in metallic glasses: A scattering perspective
Amorphous materials are ubiquitous and widely used in human society, yet their structures are far from being fully understood. Metallic glasses, a new class of amorphous materials, have attracted a great deal of interests due to their exceptional properties. In recent years, our understanding of metallic glasses increases dramatically, thanks to the development of advanced instrumentation, such as in situ x-ray and neutron scattering. In this article, we provide a brief review of recent progress in study of the structure of metallic glasses. In particular, we will emphasize, from the scattering perspective, the multiscale structures of metallic glasses, i.e., short-to-medium range atomic packing, and phase transitions in the supercooled liquid region, e.g., crystallization and liquid-to-liquid phase transition. We will also discuss, based on the understanding of their structures and phase stability, the mechanical and magnetic properties of metallic glasses.
Amorphous phase formation rules in high-entropy alloys
There have been many interesting studies on high-entropy alloys (HEAs), also known as multi-component (MC) alloys (MCAs), in recent years. MC metallic-glasses (MGs) have shown the potential to express the advantages of MCAs and MGs in tandem. Amorphous phase formation rules are a crucial issue in the HEA and MCA field. For equal or near-equal atomic ratio alloys, mixed-entropy among the elements has a significant effect on the phase formation. This paper focuses on HEA amorphous phase formation rules. In the first two sections, the recent progress in amorphous phase formation in HEAs and MCAs is reviewed, including the effective factors and correlative parameters related to amorphous phase formation. In the third section, novel MCMGs including high-entropy (HE) bulk-metallic-glass (HE-BMG) and MCMG films developed in recent decades are summarized, and the giant-magnetic-impedance (GMI) effect of MC amorphous fibers is discussed.
Universal properties of relaxation and diffusion in condensed matter
By and large the research communities today are not fully aware of the remarkable universality in the dynamic properties of many-body relaxation/diffusion processes manifested in experiments and simulations on condensed matter with diverse chemical compositions and physical structures. I shall demonstrate the universality first from the dynamic processes in glass-forming systems. This is reinforced by strikingly similar properties of different processes in contrasting interacting systems all having nothing to do with glass transition. The examples given here include glass-forming systems of diverse chemical compositions and physical structures, conductivity relaxation of ionic conductors (liquid, glassy, and crystalline), translation and orientation ordered phase of rigid molecule, and polymer chain dynamics. Universality is also found in the change of dynamics when dimension is reduced to nanometer size in widely different systems. The remarkable universality indicates that many-body relaxation/diffusion is governed by fundamental physics to be unveiled. One candidate is classical chaos on which the coupling model is based, Universal properties predicted by this model are in accord with diverse experiments and simulations.
Electron localization of linear symmetric molecular ion H32+
Electron localization in the dissociation of the symmetric linear molecular ion H32+ is investigated. The numerical simulation shows that the electron localization distribution is dependent on the central frequency and peak electric field amplitude of the external ultrashort ultraviolet laser pulse. When the electrons of the ground state are excited onto the 2pσ2Σu+ by a one-photon process, most electrons of the dissociation states are localized at the protons on both sides symmetrically. Almost no electron is stabilized at the middle proton due to the odd symmetry of the wave function. With the increase of the frequency of the external ultraviolet laser pulse, the electron localization ratio of the middle proton increases, for more electrons of the ground state are excited onto the higher 3pσ2Σu+ state. 50.9% electrons of all the dissociation events can be captured by the middle Coulomb potential well through optimizing the central frequency and peak electric field amplitude of the ultraviolet laser pulse. Besides, a direct current (DC) electric field can be utilized to control the electron motions of the dissociation states after the excitation of an ultraviolet laser pulse, and 68.8% electrons of the dissociation states can be controlled into the middle proton.
Energy sharing induced by the nonlinear interaction
Strong energy sharing is shown by numerically investigating coupled multi-component Bose-Einstein condensates (BECs) with a harmonic trap to simulate the Fermi-Pasta-Ulam model (FPU). For two-component BECs, the energy exchanging between each part, from regular, quantum beating to complete energy sharing, is explored by simulating their Husimi distributions, the time evolution of energies and the statistical entropy. Meanwhile, in the three-component case, a more complex energy sharing behavior is reported and a strong energy sharing is found.
Search algorithm on strongly regular graphsbased on scattering quantum walks
Janmark, Meyer, and Wong showed that continuous-time quantum walk search on known families of strongly regular graphs (SRGs) with parameters (N,k,λ,μ) achieves full quantum speedup. The problem is reconsidered in terms of scattering quantum walk, a type of discrete-time quantum walks. Here, the search space is confined to a low-dimensional subspace corresponding to the collapsed graph of SRGs. To quantify the algorithm's performance, we leverage the fundamental pairing theorem, a general theory developed by Cottrell for quantum search of structural anomalies in star graphs. The search algorithm on the SRGs with k scales as N satisfies the theorem, and results can be immediately obtained, while search on the SRGs with k scales as √N does not satisfy the theorem, and matrix perturbation theory is used to provide an analysis. Both these cases can be solved in O(√N) time steps with a success probability close to 1. The analytical conclusions are verified by simulation results on two SRGs. These examples show that the formalism on star graphs can be applied more generally.
Measurement-device-independent quantum cryptographic conferencing with an untrusted source
Speeding up transmissions of unknown quantum information along Ising-type quantum channels
Quantum teleportation with entanglement channels and a series of two-qubit SWAP gates between the nearest-neighbor qubits are usually utilized to achieve the transfers of unknown quantum state from the sender to the distant receiver. In this paper, by simplifying the usual SWAP gates we propose an approach to speed up the transmissions of unknown quantum information, specifically including the single-qubit unknown state and two-qubit unknown entangled ones, by a series of entangling and disentangling operations between the remote qubits with distant interactions. The generic proposal is demonstrated specifically with experimentally-existing Ising-type quantum channels without transverse interaction; liquid NMR-molecules driven by global radio frequency electromagnetic pulses and capacitively-coupled Josephson circuits driven by local microwave pulses. The proposal should be particularly useful to set up the connections between the distant qubits in a chip of quantum computing.
A self-cited pixel summation based image encryption algorithm
Uphill anomalous transport in a deterministic system with speed-dependent friction coefficient
Optimal quantum parameter estimation of two-qutrit Heisenberg XY chain under decoherence
Ultralow detection limit of giant magnetoresistance biosensor using Fe3O4-graphene composite nanoparticle label
Morphological and electrical properties of SrTiO3/TiO2/SrTiO3 sandwich structures prepared by plasma sputtering
SrTiO3 (STO) and TiO2 are insulating materials with large dielectric constants and opposite signs of the quadratic coefficient of voltage (α). Insertion of a TiO2 thin film between STO layers increases the linearity of the capacitance in response to an applied voltage, to meet the increasing demand of large-capacitance-density dynamic random access memory capacitors. Both STO and TiO2 suffer from the problem of high leakage current owing to their almost equivalent and low bandgap energies. To overcome this, the thickness of the thin TiO2 film sandwiched between the STO films was varied. A magnetron sputtering system equipped with radio frequency and direct current power supply was employed for depositing the thin films. TiN was deposited as the top and bottom metal electrodes to form a metal-insulator metal (MIM) structure, which exhibited a very large linear capacitance density of 21 fF/um2 that decreased by increasing the thickness of the TiO2 film. The leakage current decreased with an increase in the thickness of TiO2, and for a 27-nm-thick film, the measured leakage current was 2.0×10-10 A. X-ray diffraction and Raman spectroscopy revealed that TiN, STO, and TiO2 films are crystalline and TiO2 has a dominant anatese phase structure.
Atomic structure and transition properties of H-like Al in hot and dense plasmas
Electron localization of H2+ in a dc electric field
A dc electric field is utilized to steer the electron motion after the molecular ion H2+ is excited by an ultrashort ultraviolet laser pulse. The numerical simulation shows that the electron localization distribution and the dissociation control ratio are dependent on the polarization direction and amplitude of the dc electric field. Most electrons of the dissociation state move opposite to the dc electric field and stabilize at the dressed-up potential well, for the dressed-down well is occupied by the electrons of the 1sσg state.
Two-center interference in high-harmonic generation of H2+ in a combination of a mid-infrared laser field and a terahertz field
Electric-field-modified Feshbach resonances in ultracold atom-molecule collision
We present a detailed analysis of near zero-energy Feshbach resonances in ultracold collisions of atom and molecule, taking the He-PH system as an example, subject to superimposed electric and magnetic static fields. We find that the electric field can induce Feshbach resonance which cannot occur when only a magnetic field is applied, through couplings of the adjacent rotational states of different parities. We show that the electric field can shift the position of the magnetic Feshbach resonance, and change the amplitude of resonance significantly. Finally, we demonstrate that, for narrow magnetic Feshbach resonance as in most cases of ultracold atom-molecule collision, the electric field may be used to modulate the resonance, because the width of resonance in electric field scale is relatively larger than that in magnetic field scale.
Second-order temporal interference of two independent light beams at an asymmetrical beam splitter
The second-order temporal interference of classical and nonclassical light at an asymmetrical beam splitter is discussed based on two-photon interference in Feynman's path integral theory. The visibility of the second-order interference pattern is determined by the properties of the superposed light beams, the ratio between the intensities of these two light beams, and the reflectivity of the asymmetrical beam splitter. Some requirements about the asymmetrical beam splitter have to be satisfied in order to ensure that the visibility of the second-order interference pattern of nonclassical light beams exceeds the classical limit. The visibility of the second-order interference pattern of photons emitted by two independent single-photon sources is independent of the ratio between the intensities. These conclusions are important for the researches and applications in quantum optics and quantum information when an asymmetrical beam splitter is employed.
Electromagnetically induced grating in a thermal N-type four-level atomic system
Single fundamental mode photonic crystal VCSEL with high power and low threshold current optimized by modal loss analysis
A single-longitudinal-mode continuous-wave Ho3+: YVO4 laser at 2.05 μm pumped by a Tm-fibre laser
Observation of wavelength-switchable solitons in an all-polarization-maintaining erbium-doped fiber cavity based on graphene saturable absorber reflector
Kerr-lens mode-locked polycrystalline Cr: ZnS femtosecond laser pumped by a monolithic Er: YAG laser
We demonstrated a Kerr-lens mode-locked polycrystalline Cr:ZnS laser pumped by a narrow-linewidth linear-polarised monolithic Er:YAG nonplanar ring oscillator operated at 1645 nm. With a 5-mm-thick sapphire plate for intracavity dispersion compensation, a compact and stable Kerr-lens mode-locking operation was realised. The oscillator delivered 125-fs pulses at 2347 nm with an average power of 80 mW. Owing to the special polycrystalline structure of the Cr:ZnS crystal, the second to fourth harmonic generation was observed by random quasi-phase-matching.
Wavelength tunable ultra-short pulses based on a flat broadbandspectrum generated in a nonlinear ytterbium-dopedfiber amplifier
Spatiotemporal propagation dynamics of intense optical pulses in loosely confined gas-filled hollow-core fibers
Simultaneous detection of the acoustic-field aberration and Doppler shift in forward acoustic scattering
The aberration in the received acoustic field and the Doppler shift in the forward scattered field are simultaneously induced when a submerged target crosses the source-receiver line. Formulations for the two variations are developed upon an ideal forward scattering configuration. Both the field aberration and the Doppler shift are expressed as functions of the same argument–the target motion time. An experimental validation was carried out in a tank, in which the continuous wave was transmitted. The field aberration and the Doppler shift were extracted from the collected data by the simple Hilbert transform and a hybrid technique, respectively. The measured aberration and Doppler shift agree with the theoretical results. Simultaneous detection outputs are beneficial to enhance the reliability on target detection by providing both the aberrations in the received acoustic field and the Doppler shift in the forward scattered field.
Membrane-based acoustic metamaterial with near-zero refractive index
We investigate a one-dimensional acoustic metamaterial with a refractive index of near zero (RINZ) using an array of very thin elastic membranes located along a narrow waveguide pipe. The characteristics of the effective density, refractive index, and phase velocity of the metamaterial indicate that, at the resonant frequency fm, the metamaterial has zero mass density and a phase transmission that is nearly uniform. We present a mechanism for dramatic acoustic energy squeezing and anomalous acoustic transmission by connecting the metamaterial to a normal waveguide with a larger cross-section. It is shown that at a specific frequency f1, transmission enhancement and energy squeezing are achieved despite the strong geometrical mismatch between the metamaterial and the normal waveguide. Moreover, to confirm the energy transfer properties, the acoustic pressure distribution, acoustic wave reflection coefficient, and energy transmission coefficient are also calculated. These results prove that the RINZ metamaterial provides a new design method for acoustic energy squeezing, super coupling, wave front transformation, and acoustic wave filtering.
Methods of reduction for Lagrange systems on time scaleswith nabla derivatives
Nonlinear control of spacecraft formation flying with disturbance rejection and collision avoidance
A nonlinear controller for disturbances rejection and collision avoidance is proposed for spacecraft formation flying. The formation flying is described by a nonlinear model with the J2 perturbation and atmospheric drag. Based on the theory of the state-dependent Riccati equation (SDRE), a finite time nonlinear control law is developed for the nonlinear dynamics involved in formation flying. Then, a compensative internal mode (IM) control law is added to eliminate disturbances. These two control laws compose a finite time nonlinear tracking controller with disturbances rejection. Moreover, taking safety requirements into account, the repulsive control law is incorporated in the composite controller to perform collision avoidance manoeuvres. A numerical simulation is presented to demonstrate the effectiveness of the proposed method. Compared to the conventional control method, the proposed method provides better performance in the presence of the obstacles and external disturbances.
Dynamics of a self-propelled particle under different driving modes in a channel flow
Particle transport behavior in air channel flow with multi-group Lagrangian tracking
Three-dimensional turbulent flow over cube-obstacles
Three-dimensional MHD flow over a shrinking sheet: Analytical solution and stability analysis
Fluid simulation of the pulsed bias effect on inductively coupled nitrogen discharges for low-voltage plasma immersion ion implantation
Dust acoustic waves in collisional uniform dense magnetoplasma
Nonlinear parametric interactions in ion-implanted semiconductor plasmas having strain-dependent dielectric constants
Femtosecond laser induced nanostructuring of zirconium in liquid confined environment
Thermal and induced flow characteristics of radio frequency surface dielectric barrier discharge plasma actuation at atmospheric pressure
End-on x-ray backlighting experiments for axial diagnostics of wire-array Z-pinch plasma on PPG-1
An X-pinch axial backlighting system has been designed to quantitatively measure the density distribution of wire-array Z-pinch plasmas. End-on backlighting experiments were carried out on a 200 kA, 100 ns pulsed-power generator (PPG-1) at the Tsinghua University. Compared with side-on backlighting, end-on measurements provide an axial view of the evolution of Z-pinch plasmas. Early stages of 2-, 4-, and 8-wire Z-pinch plasmas were observed via point-projection backlighting radiography with a relatively high success rate. The density distribution of Z-pinch plasma on the r-θ plane was obtained directly from the images with the help of step wedges, and the inward radial velocity was calculated. The ablation rates obtained by X-pinch backlighting experiments are compared in detail with those calculated by the rocket model and the results show consistency.
Abnormal breakdown of Stokes-Einstein relation in liquid aluminium
Studies on the nucleation of MBE grown III-nitride nanowires on Si
Zero and controllable thermal expansion in HfMgMo3-xWxO12
HfMgMo3-xWxO12 with x=0.5, 1.0, 1.5, 2.0, and 2.5 are developed with a simple solid state method. With increasing the content of W, solid solutions of HfMgMo3-xWxO12 crystallize in an orthorhombic structure for x≤2.0 and a monoclinic structure for x>2.0. A near-zero thermal expansion (ZTE) is realized for HfMgMo2.5W0.5O12 and negative coefficients of thermal expansion (NCTE) are achieved for other compositions with different values. The ZTE and variation of NCTE are attributed to the difference in electronegativity between W and Mo and incorporation of a different amount of W, which cause variable distortion of the octahedra and softening of the MoO4 tetrahedra, and hence an enhanced NCTE in the a- and c-axis and reduced CTE in the b-axis as revealed by Raman spectroscopy and x-ray diffraction.
Crystallization of amorphous silicon beyond the crystallized polycrystalline silicon region induced by metal nickel
Crystallization of amorphous silicon (a-Si) which starts from the middle of the a-Si region separating two adjacent metal-induced crystallization (MIC) polycrystalline silicon (poly-Si) regions is observed. The crystallization is found to be related to the distance between the neighboring nickel-introducing MIC windows. Trace nickel that diffuses from the MIC window into the a-Si matrix during the MIC heat-treatment is experimentally discovered, which is responsible for the crystallization of the a-Si beyond the MIC front. A minimum diffusion coefficient of 1.84×10-9 cm2/s at 550℃ is estimated for the trace nickel diffusion in a-Si.
Tuning the thermal conductivity of strontium titanate through annealing treatments
Measurement and analysis of the surface roughness of Ag film used in plasmonic lithography
Ultrafast optical probe of coherent acoustic phonons in Co2MnAl Heusler film
In this work, pronounced oscillations in the time-resolved reflectivity of Heusler alloy Co2MnAl films which are epitaxially grown on GaAs substrates are observed and investigated as a function of film thickness, probe wavelength, external magnetic field and temperature. Our results suggest that the oscillation response at 24.5 GHz results from the coherent phonon generation in Co2MnAl film and can be explained by a propagating strain pulse model. From the probe wavelength dependent oscillation frequency, a sound velocity of (3.85±0.1)×103 m/s at 800 nm for the epitaxial Co2MnAl film is determined at room temperature. The detected coherent acoustic phonon generation in Co2MnAl reported in this work provides a valuable reference for exploring the high-speed magnetization manipulation via magnetoelastic coupling for future spintronic devices based on Heusler alloy films.
Electronic structure and magnetic properties of rare-earthperovskite gallates from first principles
Control of topological phase transitions in Dirac semimetal films by exchange fields
The exchange field effects on topological Dirac semimetal (DSM) films are discussed in this article. A topological phase transition can be controlled by tuning the exchange field together with the quantum confinement effects. What is more interesting is that the system can transit into the quantum anomalous Hall (QAH) state from the topologically trivial state (Z2=0) or from the topologically nontrivial state (Z2=1), depending on the thickness of the DSM films. This provides a useful mechanism to realize the QAH state from the DSM.
Implementation of LDA+Gutzwiller with Newton's method
In order to calculate the electronic structure of correlated materials, we propose implementation of the LDA+Gutzwiller method with Newton's method. The self-consistence process, efficiency and convergence of calculation are improved dramatically by using Newton's method with golden section search and other improvement approaches. We compare the calculated results by applying the previous linear mix method and Newton's method. We have applied our code to study the electronic structure of several typical strong correlated materials, including SrVO3, LaCoO3, and La2O3Fe2Se2. Our results fit quite well with the previous studies.
Direct spin-phonon coupling of spin-flip relaxation in quantum dots
Within the frame of the Pavlov-Firsov spin-phonon coupling model, we study the spin-flip assisted by the acoustical phonon scattering between the first-excited state and the ground state in quantum dots. We analyze the behaviors of the spin relaxation rates as a function of an external magnetic field and lateral radius of quantum dot. The different trends of the relaxation rates depending on the magnetic field and lateral radius are obtained, which may serve as a channel to distinguish the relaxation processes and thus control the spin state effectively.
Improved thermoelectric performance in p-type Bi0.48Sb1.52Te3 bulk material by adding MnSb2Se4
Spin-valley Hall conductivity of doped ferromagnetic silicene under strain
The spin-valley Hall conductivity (SHC-VHC) of two-dimensional material ferromagnetic graphene's silicon analog, silicene, is investigated in the presence of strain within the Kubo formalism in the context of the Kane-Mele Hamiltonian. The Dirac cone approximation has been used to investigate the dynamics of carriers under the strain along the armchair (AC) direction. In particular, we study the effect of external static electric field on these conductivities under the strain. In the presence of the strain, the carriers have a larger effective mass and the transport decreases. Our findings show that SHC changes with respect to the direction of the applied electric field symmetrically while VHC increases independently. Furthermore, the reflection symmetry of the structure has been broken with the electric field and a phase transition occurs to topological insulator for strained ferromagnetic silicene. A critical strain is found in the presence of the electric field around 45%. SHC (VHC) decreases (increases) for strains smaller than this value symmetrically while it increases (decreases) for strains larger than one.
Dynamic control of the terahertz rainbow trapping effect based on a silicon-filled graded grating
Diffraction properties of binary graphene sheet arrays
First-principles study of structural, electronic, and optical properties of cubic InAsxNyP1-x-y triangular quaternary alloys
Low power fluorine plasma effects on electrical reliability of AlGaN/GaN high electron mobility transistor
Quantum critical behavior in an antiferromagnetic heavy-fermion Kondo lattice system (Ce1-xLax)2Ir3Ge5
The measurements on temperature dependences of magnetic susceptibility χ(T), specific heat C(T), and electrical resistivity ρ(T) were carried out for the antiferromagnetic (AFM) (Ce1-xLax)2Ir3Ge5 (0≤x≤0.66) system. It was found that the Neel temperature TN decreases with increasing La content x, and reaches 0 K near a critical content xcr=0.6. A new phase diagram was constructed based on these measurements. A non-Fermi liquid behavior in ρ(T) and a logT relationship in C(T) were found in the samples near xcr, indicating them to be near an AFM quantum critical point (QCP) with strong spin fluctuation. Our finding indicates that (Ce1-xLax)2Ir3Ge5 may be a new platform to search for unconventional superconductivity.
Effect of Sb-doping on martensitic transformation and magnetocaloric effect in Mn-rich Mn50Ni40Sn10-xSbx (x=1, 2, 3, and 4) alloys
We investigate the influence of Sb-doping on the martensitic transformation and magnetocaloric effect in Mn50Ni40Sn10-xSbx (x=1, 2, 3, and 4) alloys. All the prepared samples exhibit a B2-type structure with the space group Fm3m at room temperature. The substitution of Sb increases the valence electron concentration and decreases the unit cell volume. As a result, the magnetostructural transformation shifts rapidly towards higher temperatures as x increases. The changes in magnetic entropy under different magnetic field variations are explored around this transformation. The isothermal magnetization curves exhibit typical metamagnetic behavior, indicating that the magnetostructural transformation can be induced by a magnetic field. The tunable martensitic transformation and magnetic entropy changes suggest that Mn50Ni40Sn10-xSbx alloys are attractive candidates for applications in solid-state refrigeration.
Faster vortex core switching with lower current density using three-nanocontact spin-polarized currents in a confined structure
Diverse features of magnetization curves of uniaxial crystals: A simulation study
A novel P-channel SOI LDMOS structure with non-depletion potential-clamped layer
Semi-analytical method of calculating the electrostatic interaction of colloidal solutions
Temperature-dependent photoluminescence on organic-inorganicmetal halide perovskite CH3NH3PbI3-xClx prepared onZnO/FTO substrates using a two-step method
High-efficiency InGaN/AlInGaN multiple quantum wells with lattice-matched AlInGaN superlattices barrier
Roles of voltage in semi-insulating GaAs photoconductive semiconductor switch
Analysis of localization effect in blue-violet light emitting InGaN/GaN multiple quantum wells with different well widths
Tunable band gap and optical properties of surface functionalized Sc2C monolayer
Effects of thickness & shape on localized surface plasmon resonance of sexfoil nanoparticles
Rare earth Ce-modified (Ti,Ce)/a-C: H carbon-based filmon WC cemented carbide substrate
High thermal stability of diamond-cBN-B4C-Si composites
Magnetoelectric effect in multiferroic NdMn2O5
Highly sensitive polymer photodetectors with a wide spectral response range
Alleviating hysteresis and improving device stability of perovskite solar cells via alternate voltage sweeps
Impact of neutron-induced displacement damage on the single event latchup sensitivity of bulk CMOS SRAM
Since the displacement damage induced by the neutron irradiation prior has negligible impact on the performance of the bulk CMOS SRAM, we use the neutron irradiation to degrade the minority carrier lifetime in the regions responsible for latchup. With the experimental results, we discuss the impact of the neutron-induced displacement damage on the SEL sensitivity and qualitative analyze the effectiveness of this suppression approach with TCAD simulation.
Random telegraph noise on the threshold voltage of multi-level flash memory
Photoemission cross section: A critical parameter in the impurity photovoltaic effect
Heteromaterial-gate line tunnel field-effect transistor based on Si/Ge heterojunction
Very long wavelength infrared focal plane arrays with 50% cutoff wavelength based on type-II InAs/GaSb superlattice
Nonlinear profile order for three-dimensional hybrid radial acquisition applied to self-gated free-breathing cardiac cine MRI
Community detection in signed networks based on discrete-time model
Entropy-based link prediction in weighted networks
Asymptotic bounded consensus tracking of double-integratormulti-agent systems with bounded-jerk target based onsampled-data without velocity measurements
Theoretical and experimental study on broadband terahertz atmospheric transmission characteristics