Evidence for Transition Temperature Fluctuation Induced Pinning im MgB$_2$ Superconductor

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dc.creatorQin, M. J.
dc.creatorWang, X. L.
dc.creatorLiu, H. K.
dc.creatorShi, S. X.
dc.date2001-08-10
dc.date.accessioned2026-07-07T02:42:24Z
dc.date.available2026-07-07T02:42:24Z
dc.descriptionThe magnetic field dependent critical current density $j_c(B)$ of a MgB$_2$ bulk sample has been obtained by means of magnetization hysteresis measurements. The $j_c(B)$ curves at different temperatures demonstrate a crossover from single vortex pinning to small-bundle vortex pinning, when the field is larger than the crossover field $B_{sb}$. The temperature dependence of the crossover field $B_{sb}(T)$ is in agreement with a model of randomly distributed weak pinning centers via the spatial fluctuations of the transition temperature ($δT_c$-pinning), while pinning due to the mean free path fluctuations ($δl$-pinning) is not observed.
dc.description11 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0108172
dc.identifierhttp://arxiv.org/abs/cond-mat/0108172
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18124
dc.subjectSuperconductivity
dc.titleEvidence for Transition Temperature Fluctuation Induced Pinning im MgB$_2$ Superconductor
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