Mixed-State Dissipation in Zero Temperature Limit in $MgB_2$ Thin Films

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dc.creatorJia, Y.
dc.creatorHuang, Y.
dc.creatorYang, H.
dc.creatorShan, L.
dc.creatorRen, C.
dc.creatorZhuang, C. G.
dc.creatorCui, Y.
dc.creatorLi, Qi
dc.creatorLiu, Z. K.
dc.creatorXi, X. X.
dc.creatorWen, H. H.
dc.date2007-03-24
dc.date.accessioned2026-07-07T07:53:45Z
dc.date.available2026-07-07T07:53:45Z
dc.descriptionWe have studied mixed-state dissipation in epitaxial MgB$_2$ thin films by measurements of resistive transition, current-voltage characteristics, Hall effect, and point-contact tunnelling spectrum. We found that unlike single gap superconductors with negligible vortex quantum fluctuations in which vortices are frozen at T=0 K, finite zero-temperature dissipation due to vortex motion exists in MgB$_2$ over a wide magnetic field range. This dissipation was found to be associated with proliferation of quasiparticles from the $π$-band of MgB$_2$. The result shows that the vortex fluctuations are enhanced by two-band superconductivity in MgB$_2$ and we suggest that the vortex quantum fluctuation is a possible cause of the non-vanishing zero-temperature dissipation.
dc.description4 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0703637
dc.identifierhttp://arxiv.org/abs/cond-mat/0703637
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/126342
dc.subjectSuperconductivity
dc.titleMixed-State Dissipation in Zero Temperature Limit in $MgB_2$ Thin Films
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