I-V characteristics of the vortex state in Mg B2 thin films

Huan Yang, Ying Jia, Lei Shan, Yingzi Zhang, Hai Hu Wen, Chenggang Zhuang, Zikui Liu, Qi Li, Yi Cui, Xiaoxing Xi

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17 Scopus citations

Abstract

The current-voltage (I-V) characteristics of various Mg B2 films have been studied at different magnetic fields parallel to the c axis. At fields μ0 H between 0 and 5 T, 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 μ0 H≥5 T, a finite dissipation was observed down to the lowest temperature here, T=1.7 K, 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 σ band vortices and π band 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.

Original languageEnglish (US)
Article number134513
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume76
Issue number13
DOIs
StatePublished - Oct 23 2007

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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