Temperature dependence of glassy exponent in YBa2Cu3O7-δ films

被引：0

作者：

Sannikov, I. I. ^{[1
]}

Ivanov, A. A. ^{[1
]}

Kuznetsov, A. V. ^{[1
]}

Menushenkov, A. P. ^{[1
]}

Churkin, O. A. ^{[1
]}

机构：

[1] Natl Res Nucl Univ, Moscow Engn Phys Inst, Moscow, Russia

来源：

PROCEEDINGS OF THE 27TH INTERNATIONAL SYMPOSIUM ON SUPERCONDUCTIVITY (ISS 2014) | 2015年 / 65卷

关键词：

magnetic flux creep; relaxation rate; glassy exponent; superconducting films; FLUX-CREEP; SINGLE-CRYSTAL; MAGNETIC-RELAXATION; SUPERCONDUCTORS;

D O I：

10.1016/j.phpro.2015.05.148

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Precise measurements of magnetic moment relaxation of YBa2Cu3O7-delta films were carried out in temperature range 4.2 K < T < 80 K at low magnetic field H approximate to 910 Oe. Temperature dependence of the glassy exponent mu of dependence of the activation energy U for vortices motion on current J was analyzed. It was obtained that mu increases from negative values at low temperatures T <= 10 K to mu approximate to 1-2 at T approximate to 40 K and decreases down to negative values at high temperatures T >= 70 K. It was shown that widely used Maley's technique and analysis of T/S(T) vs 1/J(T) dependence are unable to describe correctly strong mu(T) dependence observed in our experiments. (C) 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

引用

页码：113 / 116

页数：4

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