THEORETICAL DETERMINATION OF STRONG ELECTRON-PHONON COUPLING IN YBA2CU3O7

被引：205

作者：

COHEN, RE ^{[1
]}

PICKETT, WE ^{[1
]}

KRAKAUER, H ^{[1
]}

机构：

[1] COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 64卷 / 21期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1103/PhysRevLett.64.2575

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Large nonlocal contributions to the electron-phonon interaction in YBa2Cu3O7 are found using the linearized-augmented-plane-wave method with the frozen-phonon technique. These nonlocal effects greatly increase the electron-phonon coupling strength and lower the expected isotope effect for oxygen by increasing the coupling strength of the heavy ions. We find large anharmonicity of chain-oxygen motions, which can also enhance the superconducting transition temperature and decrease the isotope effect. Excellent overall agreement with experiment is found for the fifteen Raman-active-mode frequencies. © 1990 The American Physical Society.

引用

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页码：2575 / 2578

页数：4

相关论文

共 40 条

[1] EFFECT OF SOFT PHONONS ON SUPERCONDUCTIVITY - RE-EVALUATION AND A POSITIVE CASE FOR NB3SN [J].

ALLEN, PB .

SOLID STATE COMMUNICATIONS, 1974, 14 (10) :937-940

[2] ANISOTROPIC NORMAL-STATE TRANSPORT-PROPERTIES PREDICTED AND ANALYZED FOR HIGH-TC OXIDE SUPERCONDUCTORS [J].

ALLEN, PB ;

PICKETT, WE ;

KRAKAUER, H .

PHYSICAL REVIEW B, 1988, 37 (13) :7482-7490

[3] A HIGH-RESOLUTION NEUTRON POWDER DIFFRACTION STUDY ON HIGH-TC SUPERCONDUCTOR YBA2CU3O7 [J].

ANTSON, OK ;

HIISMAKI, PE ;

POYRY, HO ;

TIITTA, AT ;

ULLAKKO, KM ;

TRUNOV, VA ;

ULYANOV, VA .

SOLID STATE COMMUNICATIONS, 1987, 64 (05) :757-760

[4] 1ST-PRINCIPLES PREDICTION OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN METALLIC HYDROGEN [J].

BARBEE, TW ;

GARCIA, A ;

COHEN, ML .

NATURE, 1989, 340 (6232) :369-371

[5]

BERGMANN G, 1973, Z PHYS, V263, P659

[6] ANOMALOUS ULTRASOUND PROPAGATION IN HIGH-TC SUPERCONDUCTORS - LA1.8SR0.2CUO4-Y AND YBA2CU3O7-DELTA [J].

BHATTACHARYA, S ;

HIGGINS, MJ ;

JOHNSTON, DC ;

JACOBSON, AJ ;

STOKES, JP ;

LEWANDOWSKI, JT ;

GOSHORN, DP .

PHYSICAL REVIEW B, 1988, 37 (10) :5901-5904

[7] RAMAN MEASUREMENTS OF YBA2CU3O7-DELTA SINGLE-CRYSTALS [J].

BURNS, G ;

DACOL, FH ;

HOLTZBERG, F ;

KAISER, DL .

SOLID STATE COMMUNICATIONS, 1988, 66 (02) :217-221

[8]

Cohen R. E., 1989, Proceedings of High-Tc Superconductors: Magnetic Interactions, P93

[9] IONIC CONTRIBUTIONS TO LATTICE INSTABILITIES AND PHONON-DISPERSION IN LA2CUO4 [J].

COHEN, RE ;

PICKETT, WE ;

BOYER, LL ;

KRAKAUER, H .

PHYSICAL REVIEW LETTERS, 1988, 60 (09) :817-820

[10] APPLICATIONS OF IONIC MODELS TO THE HIGH-TEMPERATURE SUPERCONDUCTOR LA2CUO4 [J].

COHEN, RE ;

PICKETT, WE ;

KRAKAUER, H ;

BOYER, LL .

PHYSICA B & C, 1988, 150 (1-2) :61-73

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