κ-(BEDT-TTF)2Cu[N(CN)2]Br:: A fully gapped strong-coupling superconductor

被引：135
作者：
Elsinger, H
Wosnitza, J
Wanka, S
Hagel, J
Schweitzer, D
Strunz, W
机构：
[1] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany
[2] Univ Stuttgart, Inst Phys, D-70550 Stuttgart, Germany
[3] Heidelberg Univ, Inst Anorgan Chem, D-79120 Heidelberg, Germany
来源：
PHYSICAL REVIEW LETTERS | 2000年 / 84卷 / 26期
关键词：
D O I：
10.1103/PhysRevLett.84.6098
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
High-resolution specific-heat measurements of the organic superconductor kappa-(BEDT-TTF)(2)-Cu[N(CN)(2)]Br in the superconducting (B = 0) and normal (B = 14 T) states show a clearly resolvable anomaly at T-c = 11.5 K and an electronic contribution, C-es, which can be reasonably well described by strong-coupling BCS theory. Most importantly, C-es vanishes exponentially in the superconducting state which gives evidence for a fully gapped order parameter.
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页码：6098 / 6101
页数：4
相关论文
共 33 条
[1]   TRANSITION-TEMPERATURE OF STRONG-COUPLED SUPERCONDUCTORS REANALYZED [J].
ALLEN, PB ;
DYNES, RC .
PHYSICAL REVIEW B, 1975, 12 (03) :905-922
[2]   SPECIFIC-HEAT IN HIGH MAGNETIC-FIELD OF KAPPA-DI[BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE]-DI(THIOCYANO)CUPRATE [KAPPA-(ET)2CU(NCS)2] - EVIDENCE FOR STRONG-COUPLING SUPERCONDUCTIVITY [J].
ANDRAKA, B ;
KIM, JS ;
STEWART, GR ;
CARLSON, KD ;
WANG, HH ;
WILLIAMS, JM .
PHYSICAL REVIEW B, 1989, 40 (16) :11345-11347
[3]   SPECIFIC-HEAT OF THE HIGH-TC ORGANIC SUPERCONDUCTOR KAPPA-(ET)2CU[N(CN)2]BR [J].
ANDRAKA, B ;
JEE, CS ;
KIM, JS ;
STEWART, GR ;
CARLSON, KD ;
WANG, HH ;
CROUCH, AVS ;
KINI, AM ;
WILLIAMS, JM .
SOLID STATE COMMUNICATIONS, 1991, 79 (01) :57-59
[4]   Low-temperature penetration depth of κ-(ET)2Cu[N(CN)2]Br and κ-(ET)2Cu(NCS)2 [J].
Carrington, A ;
Bonalde, IJ ;
Prozorov, R ;
Giannetta, RW ;
Kini, AM ;
Schlueter, J ;
Wang, HH ;
Geiser, U ;
Williams, JM .
PHYSICAL REVIEW LETTERS, 1999, 83 (20) :4172-4175
[5]   The quantum-classical metal [J].
Clarke, DG ;
Strong, SP ;
Chaikin, PM ;
Chashechkina, EI .
SCIENCE, 1998, 279 (5359) :2071-2076
[6]   Strong-coupling features due to quasiparticle interactions in two-dimensional superconductors [J].
Coffey, D .
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1998, 305 (1-2) :139-158
[7]   C-13 NMR-STUDIES OF THE NORMAL AND SUPERCONDUCTING STATES OF THE ORGANIC SUPERCONDUCTOR KAPPA-(ET)(2)CU[N(CN)(2)]BR [J].
DESOTO, SM ;
SLICHTER, CP ;
KINI, AM ;
WANG, HH ;
GEISER, U ;
WILLIAMS, JM .
PHYSICAL REVIEW B, 1995, 52 (14) :10364-10368
[8]  
GLADSTONE G, 1969, SUPERCONDUCTIVITY, V2, P779
[9]   SPECIFIC-HEAT OF SUPERCONDUCTING KAPPA-(BEDT-TTF)2CU(NCS)2 NEAR TC [WHERE BEDT-TTF IS BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE] [J].
GRAEBNER, JE ;
HADDON, RC ;
CHICHESTER, SV ;
GLARUM, SH .
PHYSICAL REVIEW B, 1990, 41 (07) :4808-4810
[10]  
Ishiguro T., 1998, ORGANIC SUPERCONDUCT
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