NONMONOTONIC RESISTIVITY TRANSITIONS IN ANTIGRANULOCYTES SUPERCONDUCTING CERAMICS

被引：24

作者：

GERBER, A

GRENET, T

CYROT, M

BEILLE, J

机构：

[1] Laboratoire Louis Néel, C.N.R.S., 166 X

来源：

PHYSICAL REVIEW B | 1991年 / 43卷 / 16期

关键词：

D O I：

10.1103/PhysRevB.43.12935

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nonmonotonic forms of resistive superconducting transition as a function of temperature and magnetic field have been observed in granular high-T(c) ceramics of the electron-type family L(2-x)M(x)CuO4-y. The behavior is compared with that of low-temperature granular superconductors and is treated by the conventional terms of the energy gap and Josephson and quasiparticle tunnelings. The values of the intragranular upper critical field H(c2) perpendicular to the a-b plane of Sm-Ce-Cu-O are extracted. We find evidence for the appearance of superconductivity in individual grains at temperatures significantly higher than the resistance onset temperature.

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页码：12935 / 12942

页数：8

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