Magnetic relaxation and collective vortex creep in FeTe0.6Se0.4 single crystal

被引：46

作者：

Sun, Yue ^{[1
,2
]}

Taen, Toshihiro ^{[2
]}

Tsuchiya, Yuji ^{[2
]}

Pyon, Sunseng ^{[2
]}

Shi, Zhixiang ^{[1
]}

Tamegai, Tsuyoshi ^{[2
]}

机构：

[1] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China

[2] Univ Tokyo, Dept Appl Phys, Bunkyo Ku, Tokyo 1138656, Japan

来源：

EPL | 2013年 / 103卷 / 05期

基金：

日本学术振兴会;

关键词：

HIGH-TEMPERATURE SUPERCONDUCTORS; FLUX-CREEP; ACTIVATION-ENERGIES; YBA2CU4O8; FILMS; CURRENT-DENSITY; YBA2CU3O7-X; DEPENDENCE;

D O I：

10.1209/0295-5075/103/57013

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the vortex dynamics in a high-quality FeTe0.6Se0.4 single crystal by performing magnetization measurements of the screening current density Js and flux creep rate S. The temperature dependence of S shows a plateau in the intermediate-temperature region with a high creep rate similar to 0.03, which is interpreted in the framework of the collective creep theory. A crossover from elastic to plastic creep is observed. The glassy exponent and barrier height for the flux creep are directly determined by the extended Maley's method. J(s) with flux creep, obtained from magnetic hysteresis loops, is successfully reproduced based on the collective creep analysis. We also approach the critical current density without flux creep by means of the generalized inversion scheme, which proves that the dl and dTc pinning coexist in the FeTe0.6Se0.4 single crystal. Copyright (C) EPLA, 2013

引用

页数：6

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