Chin. Phys. B
Citation Search Quick Search

ISSN 1674-1056 (Print)
CN 11-5639/O4
   » About CPB
   » Editorial Board
   » SCI IF
   » Staff
   » Contact
Browse CPB
   » In Press
   » Current Issue
   » Earlier Issues
   » View by Fields
   » Top Downloaded
   » Sci Top Cited
   » Submit an Article
   » Manuscript Tracking
   » Call for Papers
   » Scope
   » Instruction for Authors
   » Copyright Agreement
   » Templates
   » Author FAQs
   » PACS
   » Review Policy
   » Referee Login
   » Referee FAQs
   » Editor in Chief Login
   » Editor Login
   » Office Login

Photoluminescence in fluorescent 4H-SiC single crystal adjusted by B, Al, and N ternary dopants Hot!

Shi-Yi Zhuo(卓世异), Xue-Chao Liu(刘学超), Wei Huang(黄维), Hai-Kuan Kong(孔海宽), Jun Xin(忻隽), Er-Wei Shi(施尔畏)
Chin. Phys. B, 2019, 28 (1): 017101 doi: 10.1088/1674-1056/28/1/017101
Full Text: [PDF 455 KB] (19) RICH HTML
Show Abstract

This paper reports the sensitive effect of photoluminescence peak intensity and transmittance affected by B, Al, and N dopants in fluorescent 4H-SiC single crystals. The crystalline type, doping concentration, photoluminescence spectra, and transmission spectra were characterized at room temperature. It is found that the doped 4H-SiC single crystal emits a warm white light covering a wide range from 460 nm to 720 nm, and the transmittance increases from ~10% to ~60% with the fluctuation of B, Al, and N ternary dopants. With a parameter of CD-A, defined by B, Al, and N concentration, the photoluminescence and transmittance properties can be adjusted by optimal doping regulation.

Electronic synapses based on ultrathin quasi-two-dimensional gallium oxide memristor Hot!

Shuopei Wang(王硕培), Congli He(何聪丽), Jian Tang(汤建), Rong Yang(杨蓉), Dongxia Shi(时东霞), Guangyu Zhang(张广宇)
Chin. Phys. B, 2019, 28 (1): 017304 doi: 10.1088/1674-1056/28/1/017304
Full Text: [PDF 1465 KB] (94) RICH HTML
Show Abstract

Synapse emulation is very important for realizing neuromorphic computing, which could overcome the energy and throughput limitations of today's computing architectures. Memristors have been extensively studied for using in nonvolatile memory storage and neuromorphic computing. In this paper, we report the fabrication of vertical sandwiched memristor device using ultrathin quasi-two-dimensional gallium oxide produced by squeegee method. The as-fabricated two-terminal memristor device exhibited the essential functions of biological synapses, such as depression and potentiation of synaptic weight, transition from short time memory to long time memory, spike-timing-dependent plasticity, and spike-rate-dependent plasticity. The synaptic weight of the memristor could be tuned by the applied voltage pulse, number, width, and frequency. We believe that the injection of the top Ag cations should play a significant role for the memristor phenomenon. The ultrathin of medium layer represents an advance to integration in vertical direction for future applications and our results provide an alternative way to fabricate synaptic devices.

High performance GaSb based digital-grown InGaSb/AlGaAsSb mid-infrared lasers and bars Hot!

Sheng-Wen Xie(谢圣文), Yu Zhang(张宇), Cheng-Ao Yang(杨成奥), Shu-Shan Huang(黄书山), Ye Yuan(袁野), Yi Zhang(张一), Jin-Ming Shang(尚金铭), Fu-Hui Shao(邵福会), Ying-Qiang Xu(徐应强), Hai-Qiao Ni(倪海桥), Zhi-Chuan Niu(牛智川)
Chin. Phys. B, 2019, 28 (1): 014208 doi: 10.1088/1674-1056/28/1/014208
Full Text: [PDF 580 KB] (30) RICH HTML
Show Abstract

InGaSb/AlGaAsSb double-quantum-well diode lasers emitting around 2 μm are demonstrated. The AlGaAsSb barriers of the lasers are grown with digital alloy techniques consisting of binary AlSb/AlAs/GaSb short-period pairs. Peak power conversion efficiency of 26% and an efficiency higher than 16% at 1 W are achieved at continuous-wave operation for a 2-mm-long and 100-μm-wide stripe laser. The maximum output power of a single emitter reaches to 1.4 W at 7 A. 19-emitter bars with maximum efficiency higher than 20% and maximum power of 16 W are fabricated. Lasers with the short-period-pair barriers are proved to have improved temperature properties and wavelength stabilities. The characteristic temperature (T0) is up to 140℃ near room temperature (25-55℃).

Imaging the diffusion pathway of Al3+ ion in NASICON-type (Al0.2Zr0.8)20/19Nb(PO4)3 as electrolyte for rechargeable solid-state Al batteries Hot!

Jie Wang(王捷), Chun-Wen Sun(孙春文), Yu-Dong Gong(巩玉栋), Huai-Ruo Zhang(张怀若), Jose Antonio Alonso, María Teresa Fernández-Díaz, Zhong-Lin Wang(王中林), John B Goodenough
Chin. Phys. B, 2018, 27 (12): 128201 doi: 10.1088/1674-1056/27/12/128201
Full Text: [PDF 1313 KB] (106) RICH HTML
Show Abstract

Among all-solid-state batteries, rechargeable Al-ion batteries have attracted most attention because they involve three-electron-redox reactions with high theoretic specific capacity. However, the solid Al-ion conductor electrolytes are less studied. Here, the microscopic path of Al3+-ion conduction of NASICON-type (Al0.2Zr0.8)20/19Nb(PO4)3 oxide is identified by temperature-dependent neutron powder diffraction and aberration-corrected scanning transmission electron microscopy experiments. (Al0.2Zr0.8)20/19Nb(PO4)3 shows a rhombohedral structure consisting of a framework of (Zr,Nb)O6 octahedra sharing corners with (PO4) tetrahedra; the Al occupy trigonal antiprisms exhibiting extremely large displacement factors. This suggests a strong displacement of Al ions along the c axis of the unit cell as they diffuse across the structure by a vacancy mechanism. Negative thermal expansion behavior is also identified along a and b axes, due to folding of the framework as temperature increases.

Temporal pulsed x-ray response of CdZnTe:In detector Hot!

Rong-Rong Guo(郭榕榕), Ya-Dong Xu(徐亚东), Gang-Qiang Zha(查钢强), Tao Wang(王涛), Wan-Qi Jie(介万奇)
Chin. Phys. B, 2018, 27 (12): 127202 doi: 10.1088/1674-1056/27/12/127202
Full Text: [PDF 502 KB] (35) RICH HTML
Show Abstract

The temporal response of cadmium-zinc-telluride (CZT) crystals is evaluated at room temperature by using an ultrafast-pulsed x-ray source. The dynamics of carrier relaxation in a CZT single crystal is modeled at a microscopic level based on a multi-trapping effect. The effects of the irradiation flux and bias voltage on the amplitude and full width at half maximum (FWHM) of the transient currents are investigated. It is demonstrated that the temporal response process is affected by defect level occupation fraction. A fast photon current can be achieved under intense pulsed x-ray irradiation to be up to 2.78×109 photons mm-2·s-1. Meanwhile, it is found that high bias voltage could enhance carrier detrapping by suppressing the capture of structure defects and thus improve the temporal response of CZT detectors.

Calibration of the superconducting gravimeter based on a cold atom absolute gravimeter at NIM Hot!

Qiyu Wang(王启宇), Jinyang Feng(冯金扬), Shaokai Wang(王少凯), Wei Zhuang(庄伟), Yang Zhao(赵阳), Lishuang Mou(牟丽爽), Shuqing Wu(吴书清)
Chin. Phys. B, 2018, 27 (12): 123701 doi: 10.1088/1674-1056/27/12/123701
Full Text: [PDF 1138 KB] (45) RICH HTML
Show Abstract

The scale factor of a superconducting gravimeter (SG) is usually calibrated by using simultaneous and co-located gravity measurements with the FG5-type absolute gravimeter (AG). In this paper, another new kind of absolute gravimeter-cold atom gravimeter (CAG) is first reported to calibrate the SG. Five-day side-by-side gravity measurements have been carried out by using our CAG (NIM-AGRb-1) to calibrate the SG (iGrav-012) located at Changping Campus of the National Institute of Metrology (NIM) of China. A weighted least-squares method is applied to determine the scale factor and the result is given as (-928.01±0.73) nm·-2·V-1 with a precision of 0.79‰. We have demonstrated that a calibration precision of 1‰ level can be achieved after 3 days of parallel observations at spring tide. The obtained calibration results are then compared with the previous calibration by FG5X-249, which shows that the calibration precision obtained by using NIM-AGRb-1 was slightly higher than FG5X-249 with the same time interval. The factors affecting the calibration precision are analyzed in the calibrations by means of different AGs. Finally, several calibration experiments for SG iGrav-012 are discussed. The final scale factor is estimated as (-927.58±0.36) nm·-2·V-1 with an accuracy of 0.39‰. Our main results demonstrate that the CAGs can be used for high-precision calibrations of SGs.

Trapped Bose-Einstein condensates with quadrupole-quadrupole interactions Hot!

An-Bang Wang(王安邦), Su Yi(易俗)
Chin. Phys. B, 2018, 27 (12): 120307 doi: 10.1088/1674-1056/27/12/120307
Full Text: [PDF 730 KB] (79) RICH HTML
Show Abstract

We numerically investigate the ground-state properties of a trapped Bose-Einstein condensate with quadrupole-quadrupole interaction. We quantitatively characterize the deformations of the condensate induced by the quadrupolar interaction. We also map out the stability diagram of the condensates and explore the trap geometry dependence of the stability.

A single-crystal neutron diffraction study on magnetic structure of CsCo2Se2 Hot!

Juanjuan Liu(刘娟娟), Jieming Sheng(盛洁明), Wei Luo(罗伟), Jinchen Wang(汪晋辰), Wei Bao(鲍威), Jinhu Yang(杨金虎), Minghu Fang(方明虎), S A Danilkin
Chin. Phys. B, 2018, 27 (11): 117401 doi: 10.1088/1674-1056/27/11/117401
Full Text: [PDF 1145 KB] (73) RICH HTML
Show Abstract

The magnetic structure of CsCo2Se2 was investigated using single-crystal neutron diffraction technique. An antiferromagnetic transition with the propagation vector (0,0,1) was observed at TN=78 K. The Co magnetic moment 0.772(6) μB at 10 K pointing in the basal plane couples ferromagnetically in the plane, which stacks antiferromagnetically along the c direction. Tuning and suppressing the interplane antiferromagnetic interaction may be crucial to induce a superconducting state in the material.

High capacity sodium-rich layered oxide cathode for sodium-ion batteries Hot!

Gen-Cai Guo(郭根材), Changhao Wang(王长昊), Bang-Ming Ming(明帮铭), Si-Wei Luo(罗斯玮), Heng Su(苏恒), Bo-Ya Wang(王博亚), Ming Zhang(张铭), Hai-Jun Yu(尉海军), Ru-Zhi Wang(王如志)
Chin. Phys. B, 2018, 27 (11): 118801 doi: 10.1088/1674-1056/27/11/118801
Full Text: [PDF 1621 KB] (44) RICH HTML
Show Abstract

Sodium-ion batteries have attracted significant recent attention currently considering the limited available lithium resource. However, the energy density of sodium-ion batteries is still insufficient compared to lithium-ion batteries, mainly because of the unavailability of high-energy cathode materials. In this work, a novel sodium-rich layered oxide material (Na2MnO3) is reported with a dynamical stability similar to that of the Li2MnO3 structure and a high capacity of 269.69 mA·h·g1, based on first-principles calculations. Sodium ion de-intercalation and anionic reaction processes are systematically investigated, in association with sodium ions migration phenomenon and structure stability during cycling of NaxMnO3 (1 ≤ x ≤ 2). In addition, the charge compensation during the initial charging process is mainly contributed by oxygen, where the small differences of the energy barriers of the paths 2c→4h, 4h→2c, 4h→4h, 2c→2b, and 4h→2b indicate the reversible sodium ion occupancy in transitional metal and sodium layers. Moreover, the slow decrease of the elastic constants is a clear indication of the high cycle stability. These results provide a framework to exploit the potential of sodium-rich layered oxide, which may facilitate the development of high-performance electrode materials for sodium-ion batteries.

Formation and stability of ultrasonic generated bulk nanobubbles Hot!

Chen-Ran Mo(莫宸冉), Jing Wang(王菁), Zhou Fang(方舟), Li-Min Zhou(周利民), Li-Juan Zhang(张立娟), Jun Hu(胡钧)
Chin. Phys. B, 2018, 27 (11): 118104 doi: 10.1088/1674-1056/27/11/118104
Full Text: [PDF 1321 KB] (55) RICH HTML
Show Abstract

Although various and unique properties of bulk nanobubbles have drawn researchers' attention over the last few years, their formation and stabilization mechanism has remained unsolved. In this paper, we use ultrasonic methods to produce bulk nanobubbles in the pure water and give a comprehensive study on the bulk nanobubbles properties and generation. The ultrasonic wave gives rise to constant oscillation in water where positive and negative pressure appears alternately. With the induced cavitation and presence of dissolved air, the bulk nanobubbles formed. “Nanosight” (which is a special instrument that combines dynamic light scattering with nanoparticle tracking analysis) was used to analyze the track and concentration of nanobubbles. Our results show that in our experiment, sufficient bulk nanobubbles were generated and we have proven they are not contaminations. We also found nanobubbles in the ultrasonic water change in both size and concentration with ultrasonic time.

Antiferromagnetic–ferromagnetic transition in zigzag graphene nanoribbons induced by substitutional doping Hot!

Shenyuan Yang(杨身园), Jing Li(李静), Shu-Shen Li(李树深)
Chin. Phys. B, 2018, 27 (11): 117102 doi: 10.1088/1674-1056/27/11/117102
Full Text: [PDF 2057 KB] (60) RICH HTML
Show Abstract

Using first-principles calculations based on density functional theory, we show that the ground state of zigzag-edged graphene nanoribbons (ZGNRs) can be transformed from antiferromagnetic (AFM) order to ferromagnetic (FM) order by changing the substitutional sites of N or B dopants. This AFM-FM transition induced by substitutional sites is found to be a consequence of the competition between the edge and bulk states. The energy sequence of the edge and bulk states near the Fermi level is reversed in the AFM and FM configurations. When the dopant is substituted near the edge of the ribbon, the extra charge from the dopant is energetically favorable to occupy the edge states in AFM configuration. When the dopant is substituted near the center, the extra charge is energetically favorable to occupy the bulk states in FM configuration. Proper substrate with weak interaction is necessary to maintain the magnetic properties of the doped ZGNRs. Our study can serve as a guide to synthesize graphene nanostructures with stable FM order for future applications to spintronic devices.

Charge compensation and capacity fading in LiCoO2 at high voltage investigated by soft x-ray absorption spectroscopy Hot!

Xing-Hui Long(龙兴辉), Yan-Ru Wu(吴颜如), Nian Zhang(张念), Peng-Fei Yu(于鹏飞), Xue-Fei Feng(冯雪飞), Shun Zheng(郑顺), Jia-Min Fu(傅佳敏), Xiao-Song Liu(刘啸嵩), Na Liu(柳娜), Meng Wang(王梦), Lei-Min Xu(徐磊敏), Jin-Ming Chen(陈锦明), Jenn-Min Lee(李振民)
Chin. Phys. B, 2018, 27 (10): 107802 doi: 10.1088/1674-1056/27/10/107802
Full Text: [PDF 1328 KB] (69) RICH HTML
Show Abstract

In order to obtain an in-depth insight into the mechanism of charge compensation and capacity fading in LiCoO2, the evolution of electronic structure of LiCoO2 at different cutoff voltages and after different cycles are studied by soft x-ray absorption spectroscopy in total electron (TEY) and fluorescence (TFY) detection modes, which provide surface and bulk information, respectively. The spectra of Co L2,3-edge indicate that Co contributes to charge compensation below 4.4 V. Combining with the spectra of O K-edge, it manifests that only O contributes to electron compensation above 4.4 V with the formation of local O 2p holes both on the surface and in the bulk, where the surficial O evolves more remarkably. The evolution of the O 2p holes gives an explanation to the origin of O2- or even O2. A comparison between the TEY and TFY of O K-edge spectra of LiCoO2 cycled in a range from 3 V to 4.6 V indicates both the structural change in the bulk and aggregation of lithium salts on the electrode surface are responsible for the capacity fading. However, the latter is found to play a more important role after many cycles.

Development of a 170-mm hollow corner cube retroreflector for the future lunar laser ranging Hot!

Yun He(何芸), Qi Liu(刘祺), Jing-Jing He(何静静), Ming Li(黎明), Hui-Zong Duan(段会宗), Hsien-Chi Yeh(叶贤基), Jun Luo(罗俊)
Chin. Phys. B, 2018, 27 (10): 100701 doi: 10.1088/1674-1056/27/10/100701
Full Text: [PDF 1231 KB] (96) RICH HTML
Show Abstract

Over the past 50 years, lunar laser ranging has made great contributions to the understanding of the Earth-Moon system and the tests of general relativity. However, because of the lunar libration, the Apollo and Lunokhod corner-cube retroreflector (CCR) arrays placed on the Moon currently limit the ranging precision to a few centimeters for a single photon received. Therefore, it is necessary to deploy a new retroreflector with a single and large aperture to improve the ranging precision by at least one order of magnitude. Here we present a hollow retroreflector with a 170-mm aperture fabricated using hydroxide-catalysis bonding technology. The precisions of the two dihedral angles are achieved by the mirror processing with a sub-arc-second precision perpendicularity, and the remaining one is adjusted utilizing an auxiliary optical configuration including two autocollimators. The achieved precisions of the three dihedral angles are 0.10 arc-second, 0.30 arc-second, and 0.24 arc-second, indicating the 68.5% return signal intensity of ideal Apollo 11/14 based on the far field diffraction pattern simulation. We anticipate that this hollow CCR can be applied in the new generation of lunar laser ranging.

Decoherence of macroscopic objects from relativistic effect Hot!

Guo-Hui Dong(董国慧), Yu-Han Ma(马宇翰), Jing-Fu Chen(陈劲夫), Xin Wang(王欣), Chang-Pu Sun(孙昌璞)
Chin. Phys. B, 2018, 27 (10): 100301 doi: 10.1088/1674-1056/27/10/100301
Full Text: [PDF 2005 KB] (113) RICH HTML
Show Abstract

We study how the decoherence of macroscopic objects originates intrinsically from the relativistic effect. With the degree of freedom of the center of mass (CM) characterizing the collective quantum state of a macroscopic object (MO), it is found that an MO consisting of N particles can decohere with a time scale of no more than √N-1. Here, the special relativity can induce the coupling of the collective motion mode and the relative motion modes in an order of 1/c2, which intrinsically results in the above minimum decoherence.

Potentials of classical force fields for interactions between Na+ and carbon nanotubes Hot!

De-Yuan Li(李德远), Guo-Sheng Shi(石国升), Feng Hong(洪峰), Hai-Ping Fang(方海平)
Chin. Phys. B, 2018, 27 (9): 098801 doi: 10.1088/1674-1056/27/9/098801
Full Text: [PDF 2293 KB] (67) RICH HTML
Show Abstract

Carbon nanotubes (CNTs) have long been expected to be excellent nanochannels for use in desalination membranes and other bio-inspired human-made channels owing to their experimentally confirmed ultrafast water flow and theoretically predicted ion rejection. The correct classical force field potential for the interactions between cations and CNTs plays a crucial role in understanding the transport behaviors of ions near and inside the CNT, which is key to these expectations. Here, using density functional theory calculations, we provide classical force field potentials for the interactions of Na+/hydrated Na+ with (7,7), (8,8), (9,9), and (10,10)-type CNTs. These potentials can be directly used in current popular classical software such as nanoscale molecular dynamics (NAMD) by employing the tclBC interface. By incorporating the potential of hydrated cation-π interactions to classical all-atom force fields, we show that the ions will move inside the CNT and accumulate, which will block the water flow in wide CNTs. This blockage of water flow in wide CNTs is consistent with recent experimental observations. These results will be helpful for the understanding and design of desalination membranes, new types of nanofluidic channels, nanosensors, and nanoreactors based on CNT platforms.

0-π transition induced by the barrier strength in spin superconductor Josephson junctions Hot!

Wen Zeng(曾文), Rui Shen(沈瑞)
Chin. Phys. B, 2018, 27 (9): 097401 doi: 10.1088/1674-1056/27/9/097401
Full Text: [PDF 405 KB] (63) RICH HTML
Show Abstract

The Andreev-like levels and the free energy of the spin superconductor/insulator/spin superconductor junction are obtained by using the Bogoliubov-de Gennes equation. The phase dependence of the spin supercurrents exhibits a 0-π transition by changing the barrier strength. The dependences of the critical current on the barrier strength and the temperature are also presented.

Visualizing light-to-electricity conversion process in InGaN/GaN multi-quantum wells with a p-n junction Hot!

Yangfeng Li(李阳锋), Yang Jiang(江洋), Junhui Die(迭俊珲), Caiwei Wang(王彩玮), Shen Yan(严珅), Haiyan Wu(吴海燕), Ziguang Ma(马紫光), Lu Wang(王禄), Haiqiang Jia(贾海强), Wenxin Wang(王文新), Hong Chen(陈弘)
Chin. Phys. B, 2018, 27 (9): 097104 doi: 10.1088/1674-1056/27/9/097104
Full Text: [PDF 666 KB] (49) RICH HTML
Show Abstract

Absorption and carrier transport behavior plays an important role in the light-to-electricity conversion process, which is difficult to characterize. Here we develop a method to visualize such a conversion process in the InGaN/GaN multi-quantum wells embedded in a p-n junction. Under non-resonant absorption conditions, a photocurrent was generated and the photoluminescence intensity decayed by more than 70% when the p-n junction out-circuit was switched from open to short. However, when the excitation photon energy decreased to the resonant absorption edge, the photocurrent dropped drastically and the photoluminescence under open and short circuit conditions showed similar intensity. These results indicate that the escaping of the photo-generated carriers from the quantum wells is closely related to the excitation photon energy.

Pressure effect in the Kondo semimetal CeRu4Sn6 with nontrivial topology Hot!

Jiahao Zhang(张佳浩), Shuai Zhang(张帅), Ziheng Chen(陈子珩), Meng Lv(吕孟), Hengcan Zhao(赵恒灿), Yi-feng Yang(杨义峰), Genfu Chen(陈根富), Peijie Sun(孙培杰)
Chin. Phys. B, 2018, 27 (9): 097103 doi: 10.1088/1674-1056/27/9/097103
Full Text: [PDF 978 KB] (88) RICH HTML
Show Abstract

Kondo semimetal CeRu4Sn6 is attracting renewed attention due to the theoretically predicted nontrivial topology in its electronic band structure. We report hydrostatic and chemical pressure effects on the transport properties of single-and poly-crystalline samples. The electrical resistivity ρ(T) is gradually enhanced by applying pressure over a wide temperature range from room temperature down to 25 mK. Two thermal activation gaps estimated from high-and low-temperature windows are found to increase with pressure. A flat ρ(T) observed at the lowest temperatures below 300 mK appears to be robust against both pressure and field. This feature as well as the increase of the energy gaps calls for more intensive investigations with respect to electron correlations and band topology.

Typicality at quantum-critical points Hot!

Lu Liu(刘录), Anders W Sandvik, Wenan Guo(郭文安)
Chin. Phys. B, 2018, 27 (8): 087501 doi: 10.1088/1674-1056/27/8/087501
Full Text: [PDF 2852 KB] (55) RICH HTML
Show Abstract

We discuss the concept of typicality of quantum states at quantum-critical points, using projector Monte Carlo simulations of an S=1/2 bilayer Heisenberg antiferromagnet as an illustration. With the projection (imaginary) time τ scaled as τ=aLz, L being the system length and z the dynamic critical exponent (which takes the value z=1 in the bilayer model studied here), a critical point can be identified which asymptotically flows to the correct location and universality class with increasing L, independently of the prefactor a and the initial state. Varying the proportionality factor a and the initial state only changes the cross-over behavior into the asymptotic large-L behavior. In some cases, choosing an optimal factor a may also lead to the vanishing of the leading finite-size corrections. The observation of typicality can be used to speed up simulations of quantum criticality, not only within the Monte Carlo approach but also with other numerical methods where imaginary-time evolution is employed, e.g., tensor network states, as it is not necessary to evolve fully to the ground state but only for sufficiently long times to reach the typicality regime.

Nonlinear uniaxial pressure dependence of the resistivity in Sr1-xBaxFe1.97Ni0.03As2 Hot!

Hui-Can Mao(毛慧灿), Dong-Liang Gong(龚冬良), Xiao-Yan Ma(马肖燕), Hui-Qian Luo(罗会仟), Yi-Feng Yang(杨义峰), Lei Shan(单磊), Shi-Liang Li(李世亮)
Chin. Phys. B, 2018, 27 (8): 087402 doi: 10.1088/1674-1056/27/8/087402
Full Text: [PDF 4743 KB] (55) RICH HTML
Show Abstract

Nematic order and its fluctuations have been widely found in iron-based superconductors. Above the nematic order transition temperature, the resistivity shows a linear relationship with the uniaxial pressure or strain along the nematic direction and the normalized slope is thought to be associated with nematic susceptibility. Here we systematically studied the uniaxial pressure dependence of the resistivity in Sr1-xBaxFe1.97Ni0.03As2, where nonlinear behaviors are observed near the nematic transition temperature. We show that it can be well explained by the Landau theory for the second-order phase transitions considering that the external field is not zero. The effect of the coupling between the isotropic and nematic channels is shown to be negligible. Moreover, our results suggest that the nature of the magnetic and nematic transitions in Sr1-xBaxFe2As2 is determined by the strength of the magnetic-elastic coupling.

Page 1 of 19 371 records
Copyright © the Chinese Physical Society
Address: Institute of Physics, Chinese Academy of Sciences, P. O. Box 603,Beijing 100190 China(100190)
Tel: 010-82649026   Fax: 010-82649027   E-Mail:
Supported by Beijing Magtech Co. Ltd. Tel: 86-010-62662699 E-mail: