Four contact electrical measurements on the anisotropic high-T-c superconductors: Voltage reversals

被引：5

作者：

Aukkaravittayapun, S

King, PJ

Benedict, KA

Latyshev, YI

Gorlova, IG

Zybtsev, S

Campbell, A

Doyle, RA

Johnson, J

Seow, WS

机构：

[1] UNIV NOTTINGHAM,DEPT PHYS,NOTTINGHAM NG7 2RD,ENGLAND

[2] RUSSIAN ACAD SCI,INST RADIOENGN & ELECT,MOSCOW 103907,RUSSIA

[3] UNIV CAMBRIDGE,IRC SUPERCONDUCT,CAMBRIDGE CB3 0HE,ENGLAND

来源：

PHYSICA C | 1996年 / 270卷 / 3-4期

关键词：

voltage reversal; anisotropy; layered superconductor; whisker;

D O I：

10.1016/S0921-4534(96)00526-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We describe three mechanisms for the anomalous voltage reversals which are occasionally observed during four contact current-voltage measurements on the high temperature superconductors. Voltage reversals have been frequently observed for whiskers of the bismuth strontium calcium copper oxide (BSSCO) compounds, and we describe measurements made on high quality whiskers of the 2:2:1:2 and 2:2:2:3 phases. A simple model based on extreme anisotropy plus offset contacts can explain the gross features of four contact measurements in the ohmic flux-flow regime, but not the wealth of reversal phenomena found for the IVVI configuration in the lower temperature irreversibility region.

引用

页码：231 / 241

页数：11

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