ANOMALOUS ISOTOPE EFFECT AND VANHOVE SINGULARITY IN SUPERCONDUCTING CU OXIDES

被引：257

作者：

TSUEI, CC

NEWNS, DM

CHI, CC

PATTNAIK, PC

机构：

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.65.2724

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

High-Tc Cu oxides such as YBa2Cu3O7 and the Bi-Sr-Ca-Cu-O systems are characterized by a near-zero oxygen-isotope effect. Recent results by Crawford et al. show, however, that the isotope effect in the La2-xSrxCuO4 system depends strongly on the doping level (x) and can significantly exceed the BCS limit. Within the framework of the BCS phonon-mediated pairing, a logarithmic (2D) Van Hove singularity in the density of states can provide a basis for understanding these anomalous isotope effects and possibly the origin of high-temperature superconductivity. © 1990 The American Physical Society.

引用

页码：2724 / 2727

页数：4

共 39 条

[1]

ALLEN PB, 1982, SOLID STATE PHYS, V37, P1

[2] Y-89 NMR EVIDENCE FOR A FERMI-LIQUID BEHAVIOR IN YBA2CU3O6+X [J].

ALLOUL, H ;

OHNO, T ;

MENDELS, P .

PHYSICAL REVIEW LETTERS, 1989, 63 (16) :1700-1703

[3] ISOTOPE EFFECT IN THE HIGH-TC SUPERCONDUCTORS BA2YCU3O7 AND BA2EUCU3O7 [J].

BATLOGG, B ;

CAVA, RJ ;

JAYARAMAN, A ;

VANDOVER, RB ;

KOUROUKLIS, GA ;

SUNSHINE, S ;

MURPHY, DW ;

RUPP, LW ;

CHEN, HS ;

WHITE, A ;

SHORT, KT ;

MUJSCE, AM ;

RIETMAN, EA .

PHYSICAL REVIEW LETTERS, 1987, 58 (22) :2333-2336

[4] NONZERO ISOTOPE EFFECT IN LA1.85SR0.15CUO4 [J].

BATLOGG, B ;

KOUROUKLIS, G ;

WEBER, W ;

CAVA, RJ ;

JAYARAMAN, A ;

WHITE, AE ;

SHORT, KT ;

RUPP, LW ;

RIETMAN, EA .

PHYSICAL REVIEW LETTERS, 1987, 59 (08) :912-914

[5] SEARCH FOR ISOTOPE EFFECT IN SUPERCONDUCTING Y-BA-CU-O [J].

BOURNE, LC ;

CROMMIE, MF ;

ZETTL, A ;

LOYE, HCZ ;

KELLER, SW ;

LEARY, KL ;

STACY, AM ;

CHANG, KJ ;

COHEN, ML ;

MORRIS, DE .

PHYSICAL REVIEW LETTERS, 1987, 58 (22) :2337-2339

[6] FEMTOSECOND THERMOMODULATION STUDY OF HIGH-TC SUPERCONDUCTORS [J].

BRORSON, SD ;

KAZEROONIAN, A ;

FACE, DW ;

CHENG, TK ;

DOLL, GL ;

DRESSELHAUS, MS ;

DRESSELHAUS, G ;

IPPEN, EP ;

VENKATESAN, T ;

WU, XD ;

INAM, A .

SOLID STATE COMMUNICATIONS, 1990, 74 (12) :1305-1308

[7]

CARBOTTE JP, 1982, SUPERCONDUCTIVITY D, P487

[8] ANOMALOUS OXYGEN ISOTOPE EFFECT IN LA2-XSRXCUO4 [J].

CRAWFORD, MK ;

KUNCHUR, MN ;

FARNETH, WE ;

MCCARRON, EM ;

POON, SJ .

PHYSICAL REVIEW B, 1990, 41 (01) :282-287

[9]

DEGENNES PG, 1989, SUPERCONDUCTIVITY ME, P125

[10]

DZYALOSHINSKII IE, 1987, JETP LETT+, V46, P118

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