Giant flux creep and irreversibility in an Y-Ba-Cu-O crystal: An alternative to the superconducting-glass model.
Giant flux creep and irreversibility in an Y-Ba-Cu-O crystal: An alternative to the superconducting-glass model.
复制标题
DOI：
10.1103/physrevlett.60.2202
复制
发表时间：
1988-05
影响因子：
8.6
通讯作者：
Y. Yeshurun;A. P. Malozemoff
中科院分区：
文献类型：
--
作者：
Y. Yeshurun;A. P. Malozemoff
我们报告了沿着Y-Ba-Cu-O单晶主轴的场冷却和零场冷却磁化强度的强各向异性磁弛豫，并用热激活磁通蠕动模型对其进行了解释。一个简单的标度参数表明，高热激活导致磁不可逆性和临界电流下降到低于阈值的可检测性在一个减少的温差1-t正比于H/sup 2/3，功率经常在实验中观察到，特别是在我们的晶体
We report strong, anisotropic magnetic relaxation of the field-cooled and zero-field--cooled magnetization along the principal axes of an Y-Ba-Cu-O single crystal and interpret it with a thermally activated flux-creep model. A simple scaling argument shows that high thermal activation causes magnetic irreversibilities and critical currents to drop below the threshold of detectability at a reduced temperature difference 1-t proportional to H/sup 2/3, a power frequently observed in experiment and in particular in our crystal