Open AccessSIMULATION ON LOCAL FLUX CREEP IN NON-IDEAL TYPE-Ⅱ SUPERCONDUCTORS:THE EFFECT O F NON-UNIFORM PINNING POTENTIAL AND SURFACE POTENTIAL
Author(s) -
Liang Feng,
Yan Shou-Sheng
Publication year - 2000
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.49.1829
Subject(s) - flux pinning , condensed matter physics , flux (metallurgy) , creep , pinning force , magnetic flux , superconductivity , magnetization , magnetic field , materials science , type ii superconductor , logarithm , physics , line (geometry) , high temperature superconductivity , thermodynamics , critical current , quantum mechanics , geometry , mathematical analysis , metallurgy , mathematics
Based on the thermally activated model,the flux creep process in the case of non-uniform pinning potential and surface pinning potential in nonideal type Ⅱ sup erconductors is studied through computer simulation.Global and local magnetizati on curves are calculated and the logarithmic time dependence of local magnetic i nduction under a constant external field is examined.The results show that the m otion of the flux is much restrained in the non-uniform case and the flux line i s easy to be captured by the strong pinning center.The surface potential has mar ked effect in preventing the flux from going into and leaving the sample.Compare d with the global behavior,the local magnetization is much more sensitive to the non-uniform pinning potential and the magnetic field sweep rate.