INFLUENCE OF A SURFACE-DEPRESSED ORDER-PARAMETER ON THE JOSEPHSON CRITICAL-CURRENT IN BI2SR2CACU2O8+X - NONHYSTERETIC BREAK JUNCTIONS

被引：9

作者：

GONNELLI, RS

PUTTERO, D

UMMARINO, GA

STEPANOV, VA

LICCI, F

机构：

[1] RUSSIAN ACAD SCI, PN LEBEDEV PHYS INST, MOSCOW, RUSSIA

[2] CNR, IST MAT SPECIALI ELETTRON & MAGNETISMO, I-43100 PARMA, ITALY

来源：

PHYSICAL REVIEW B | 1995年 / 51卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.51.12782

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We observed nonhysteretic Josephson currents in the I-V characteristics of break junctions made at 4.2 K in single crystals of Bi2Sr2CaCu2O8+x. The I(V) curves, measured at different temperatures up to Tc, are correctly fitted by the resistively shunted junction model if the effect of the thermal fluctuations is included. The temperature dependence of the Josephson critical current Ic(T) deviates massively from the ideal BCS behavior but is fitted very well by a model that takes into account the intrinsic effect of a depressed order parameter at the surface of Bi2Sr2CaCu2O8+x. © 1995 The American Physical Society.

引用

页码：12782 / 12785

页数：4

共 17 条

[1]

AMBEGAOKAR V, 1963, PHYS REV LETT, V11, P104, DOI 10.1103/PhysRevLett.11.104

[2] TUNNELING BETWEEN SUPERCONDUCTORS [J].