MAGNETIC MEASUREMENTS OF THE UPPER AND LOWER CRITICAL FIELDS OF OXYGEN-DEFICIENT YBA2CU3O7-DELTA SINGLE-CRYSTALS

被引：42

作者：

VANDERVOORT, KG

WELP, U

KESSLER, JE

CLAUS, H

CRABTREE, GW

KWOK, WK

UMEZAWA, A

VEAL, BW

DOWNEY, JW

PAULIKAS, AP

LIU, JZ

机构：

[1] UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA

[2] UNIV ILLINOIS, CHICAGO, IL 60680 USA

[3] UNIV ALBERTA, EDMONTON T6G 2J1, ALBERTA, CANADA

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.43.13042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present dc-magnetization measurements in fields up to 5 T on oxygen-deficient (T(c) congruent-to 60 K) YBa2Cu3O7-delta single crystals. The upper-critical-field slopes are -2.0 and -8.7 T/K and the lower critical fields at 5 K are 83 and 25 Oe for fields perpendicular and parallel to the Cu-O planes, respectively The upper-critical-field slope anisotropy is not substantially different from the anisotropy found for the 90-K crystals. The H(c1) values are, however, much smaller for the 60-K crystals. We explain these results through a model in which the chains do not contribute significantly to the coupling between the Cu-O planes but rather serve as a charge reservoir for the superconductivity that occurs in the planes.

引用

页码：13042 / 13048

页数：7

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