UNUSUAL BEHAVIOR IN THE UPPER CRITICAL MAGNETIC-FIELDS OF THE AMBIENT-PRESSURE ORGANIC SUPERCONDUCTOR - KAPPA-(BEDT-TTF)2CU[N(CN)2]BR [WHERE BEDT-TTF REPRESENTS BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE]

被引:93
作者
KWOK, WK
WELP, U
CARLSON, KD
CRABTREE, GW
VANDERVOORT, KG
WANG, HH
KINI, AM
WILLIAMS, JM
STUPKA, DL
MONTGOMERY, LK
THOMPSON, JE
机构
[1] ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439
[2] UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680
来源
PHYSICAL REVIEW B | 1990年 / 42卷 / 13期
关键词
D O I
10.1103/PhysRevB.42.8686
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We report a determination of the temperature dependence of the upper critical magnetic fields Hc2 for -(BEDT-TTF)2Cu[N(CN)2]Br, with the use of dc-magnetization measurements that show a well-defined diamagnetic onset. We find large slopes of -20 T/K and -2.2 T/K for H ac and H b, respectively, which lead to coherence lengths of 37 and 4. There is unusual structure in the critical fields and a possible dimensional crossover at T/Tc0.97 for Hac. Neither the slopes nor the structure are observable in the superconducting transition measured by ac magnetoresistance, which exhibits strong magnetic-field broadening similar to that of the high-Tc copper oxide superconductor YBa2Cu3O7-. We find a strong depression of Tc, as large as 1.2 K, when the sample is rapidly cooled. © 1990 The American Physical Society.
引用
收藏
页码:8686 / 8689
页数:4
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