Rigid vortices in MgB2

Magnetic relaxation of high-pressure synthesized MgB2 bulks with different thickness is investigated. It is found that the superconducting diamagnetic moment depends on time in a logarithmic way: the flux-creep activation energy decreases linearly with the current density (as expected by Kim–Anderso...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2003-09, Vol.83 (13), p.2626-2628
Main Authors: Jin, Hao, Wen, Hai-Hu, Yang, Hai-Peng, Liu, Zhi-Yong, Ren, Zhi-An, Che, Guang-Can, Zhao, Zhong-Xian
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Magnetic relaxation of high-pressure synthesized MgB2 bulks with different thickness is investigated. It is found that the superconducting diamagnetic moment depends on time in a logarithmic way: the flux-creep activation energy decreases linearly with the current density (as expected by Kim–Anderson model) and the activation energy increases linearly with the thickness of sample when it is thinner than about 1 mm. These features suggest that the vortices in the MgB2 are rather rigid, and the pinning and creep can be well described by Kim–Anderson model.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1613035