DC Magnetization Relaxation and the AC Susceptibility of YBCO Films with Strong Pinning

被引：4
作者：
Miu, L. [1 ]
Mele, P. [2 ]
Ivan, I. [1 ]
Ionescu, A. M. [1 ]
Miu, D. [3 ]
机构：
[1] Natl Inst Mat Phys, Bucharest 77125, Romania
[2] Hiroshima Univ, Inst Sustainable Sci & Dev, Higashihiroshima 7398530, Japan
[3] Natl Inst Laser Plasma & Radiat Phys, Bucharest 77125, Romania
来源：
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM | 2015年 / 28卷 / 02期
关键词：
YBCO films with BZO nanorods; AC measurements; DC magnetization relaxation; Flux flow; Flux creep; HIGH-TEMPERATURE SUPERCONDUCTORS;
D O I：
10.1007/s10948-014-2652-7
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
AC susceptibility and DC magnetization relaxation measurements have been performed for YBa2Cu3O7 films containing BaZrO3 nanorods preferentially oriented along the c axis, with the external magnetic field perpendicular to the film surface. It was found that the effective vortex activation energy U (e) supplied by the standard analysis of the frequency dependent AC magnetic response remains very high even in the vicinity of the irreversibility line indicated by the DC relaxation. We show that the large U (e) values appearing in the AC signal are related to the pinning enhanced viscous drag and significant vortex velocities.
引用
收藏
页码：361 / 365
页数：5
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