THERMAL MULTISTABILITY OF THIN YBCO FILMS CARRYING DIRECT-CURRENT

被引：19

作者：

SKOKOV, VN

KOVERDA, VP

机构：

[1] Institute of Thermophysics, Russian Academy of Sciences, Urals Division, Yekaterinburg, 620219

来源：

CRYOGENICS | 1993年 / 33卷 / 11期

关键词：

YBCO THIN FILMS; THERMAL STABILITY; SUPERCONDUCTIVITY;

D O I：

10.1016/0011-2275(93)90213-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thermal destruction of the superconducting state in thin YBCO films has been studied experimentally. The voltage-current characteristics have been determined in films during cooling in a nitrogen gas-flow cryostat and in liquid nitrogen directly. A state of thermal bistability arises when cooling samples with a rarefied gas and in this case the voltage-current characteristic is s-shaped. A state of multistability arises when cooling samples directly with liquid nitrogen. The emergence of this multistability is caused by non-stationary heat removal due to nitrogen boiling. The effect on the resistive state of films of the transitions from the one-phase convective heat exchange in liquid nitrogen to a regime of bubble boiling and from a regime of bubble boiling to a boiling crisis has been investigated.

引用

页码：1072 / 1076

页数：5

共 10 条

[1]

Al'tov V.A., 1984, STABILIZATION SUPERC

[2]

ANDRIANOV VV, 1990, ADV CRYOGENICS ENG, V35, P719

[3] NONLINEAR THERMAL RELAXATION WAVES IN HIGH-TC SUPERCONDUCTORS CARRYING CURRENT [J].