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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1996, Vol.5, No.2
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CLASSICAL AREAS OF PHENOMENOLOGY

PHOTODIFFRACTIVE EFFECTS IN SEMICONDUCTOR MICROSTRUCTURES

PAN SHI-HONG, GUO RU, XIE MING-MIN, ZHANG GUANG-YIN
Acta Phys. Sin. (Overseas Edition), 1996, 5 (2): 81-89 doi: 10.1088/1004-423X/5/2/001
Full Text: [PDF 230 KB] (Downloads:316)
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We have investigated the photodiffractive effect induced by resonant excitations in semiconductor microstructures by means of the multiple wave coupling method. We have derived set of multiple wave coupling equations for photodiffractions in the case of coexistence of refraction and absorption gratings. Numerical results of the equations for a few typical cases have been analysed in detail, and their physical significance is also discussed.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

ELECTRON DIFFUSION IN A NON-UNIFORM ELECTRIC FIELD AND A UNIFORM MAGNETIC FIELD

WEI HE-LIN, LIU ZU-LI, YU BO-MING, LI ZAI-GUANG
Acta Phys. Sin. (Overseas Edition), 1996, 5 (2): 90-99 doi: 10.1088/1004-423X/5/2/002
Full Text: [PDF 294 KB] (Downloads:316)
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A Monte Carlo simulation technique has been used to model the electron transport beharlot, especially the electron diffusion motion, in the cathode fall region of a glow discharge under the influence of a non-uniform electric field and a transverse magnetic field perpen-dicular to the cathode sheath electric field. Three types of collisions (elastic, excitation and ionization) are taken into account in our model. The electron free flying time is determined by the electron-neutral atom collision frequency. We focus attention on the electron diffusion distance and velocity. The electron-neutral atom collision processes and the electron drift velocity are also studied. The results indicate that with the increase of the magnetic field the electron diffusion distance increases and the electron diffusion velocity decreases. The results Mso show that the collision processes are enhanced by the magnetic field, this is in agreement with the experimental result. However, the axial magnetic field does not affect the electron transport behavior.

ELECTRON TRANSPORT BEHAVIOR IN NORMAL AND ABNORMAL DIRECT CURRENT DISCHARGE CATHODE SHEATH

WEI HE-LIN, LIU ZU-LI, LIU DA-MIANG, LI ZAI-GUANG, LU DONG-SHENG
Acta Phys. Sin. (Overseas Edition), 1996, 5 (2): 100-112 doi: 10.1088/1004-423X/5/2/003
Full Text: [PDF 369 KB] (Downloads:770)
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This paper studies the electron transport behavior in normal and abnormal helium direct current (dc) glow discharges using a Monte Carlo simulation, in which the influences of the electron initial energy and cathode surface reflection on the electron swarm behavior are considered. The electron-neutral atom collision processes and the electron swarm parameters (such as the number of collisions, collision rates, ionization coefficient, mean drift velocity, electron density, etc.) are analyzed. The results show that the variations of the initial energy of the electron emitted from the cathode and the cathode reflection cause a weak effect on the electron transport parameters in the two discharges. The results also indicate that the electron transport parameters are quite different in normal and abnormal discharges.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

SYNTHESIS AT AMBIENT PRESSURE AND SUPERCONDUCTIVITY OF Hg-DOPED TI-BASED DOUBLE [(T1, Hg)-O]-LAYERED CDPHATES

CHEN ZU-YAO, WEI QIN-QIAO, CAO GUANG-HAN, QIAN YI-TAI, ZHANG YONG-JIAN, WANG CHENG-YOU, WANG NAN-LING, CAO LIE-ZHAO, CHEN ZHAO-JIA
Acta Phys. Sin. (Overseas Edition), 1996, 5 (2): 113-119 doi: 10.1088/1004-423X/5/2/004
Full Text: [PDF 211 KB] (Downloads:307)
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The Hg-doped T1-based 2201 and 2212 phase layered cuprates have been successfully syn-thesized at ambient pressure and identified by X-ray powder diffraction and electron diffraction analysis. Compared with pure T1-based 2212 phase compound, there are indications that the corresponding Hg-doped T1-based compound (T11.8Hg0.2)Ba2CaCu2Oz exhibits much higher Tc (> 132K).

INFLUENCE OF IN-PLANE FIELD ON THE CRITICAL TEMPERATURE FOR THE BREAKDOWN OF VERTICAL BLOCH LINE CHAINS

HAN BAO-SHAN, HUO SHU-GUO, ZHANG HONG-YUAN, MENG GUANG-QING
Acta Phys. Sin. (Overseas Edition), 1996, 5 (2): 120-125 doi: 10.1088/1004-423X/5/2/005
Full Text: [PDF 188 KB] (Downloads:308)
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The influence of in-plane field Hip on the critical temperature T0 for the breakdown of vertical Bloch line (VBL) chains of hard domains in garnet bubble films has been inves-tigated experimentally. It was found that T0 can be significantly reduced by the increase of Hip. Besides, the critical in-plane field H′ip for the breakdown of VBL chains was measured as a function of temperature T for the same sample. As a result, the correlation between these two critical parameters, T0 and H′ip, was found. By introducing an effective in-plane field (Hip)e, the positive definiteness of the system of VBL pairs with two-dimemsional magnetization distribution was analyzed, giving rise to a theoretical expression of H′ip(T): H′ip(T) =|4πMsQ(a0+a1Q +a2Q2+a3Q3+ a4Q4)|T(T0(Hip=0)), where ai are constants. It agrees well with the experiments.

MAGNETIC POLARIZATION OF Pd SPACERS AND OSCILLATORY EXCHANGE COUPLING BETWEEN Fe AND Pd LAYERS IN Fe/Pd MULTILAYERS

MEI LIANG-MO, LI MIN, XIE SHI-JIE, LIU YI-HUA, XU RONG-LI
Acta Phys. Sin. (Overseas Edition), 1996, 5 (2): 126-142 doi: 10.1088/1004-423X/5/2/006
Full Text: [PDF 407 KB] (Downloads:320)
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Ay oscillatory behavior in specific saturation magnetization of Fe/Pd multilayers is observed. The conversion electron M?ssbauer spectroscopy and other experiments indicate that this behavior is caused by the magnetic polarization of Pd spacers, which alternates between positive and negative polarization with respect to the magnetic moments of Fe layers. The interlayer coupling between two Fe layers always keeps ferromagnetic. Then, the interlayer couplings in ferromagnetic metal/nearly ferromagnetic metal multilayers were calculated By using the model of Barnas. The results of calculation prove that the above phenomenon might appear under some condition. The influence of magnetic polarization potential of spacers and interface chemical potential on the interlayer couplings is also discussed.
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