I-V characteristics of the vortex state in MgB2 thin films

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dc.creatorYang, Huan
dc.creatorJia, Ying
dc.creatorShan, Lei
dc.creatorZhang, Yingzi
dc.creatorWen, Hai-Hu
dc.creatorZhuang, Chenggang
dc.creatorLiu, Zikui
dc.creatorLi, Qi
dc.creatorCui, Yi
dc.creatorXi, Xiaoxing
dc.date2007-04-02
dc.date2007-10-30
dc.date.accessioned2026-07-07T10:00:50Z
dc.date.available2026-07-07T10:00:50Z
dc.descriptionThe current-voltage (I-V) characteristics of various MgB2 films have been studied at different magnetic fields parallel to c-axis. At fields \mu0H between 0 and 5T, vortex liquid-glass transitions were found in the I-V isotherms. Consistently, the I-V curves measured at different temperatures show a scaling behavior in the framework of quasi-two-dimension (quasi-2D) vortex glass theory. However, at \mu0 H >= 5T, a finite dissipation was observed down to the lowest temperature here, T=1.7K, and the I-V isotherms did not scale in terms of any known scaling law, of any dimensionality. We suggest that this may be caused by a mixture of σband vortices and πband quasiparticles. Interestingly, the I-V curves at zero magnetic field can still be scaled according to the quasi-2D vortex glass formalism, indicating an equivalent effect of self-field due to persistent current and applied magnetic field.
dc.description7 pages, 9 figures
dc.identifierhttps://arxiv.org/abs/0704.0126
dc.identifierhttp://arxiv.org/abs/0704.0126
dc.identifierPhys. Rev. B 76, 134513 (2007)
dc.identifierdoi:10.1103/PhysRevB.76.134513
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/168440
dc.subjectSuperconductivity
dc.titleI-V characteristics of the vortex state in MgB2 thin films
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