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

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

2007-04-02

arxiv.org/abs/0704.0126v2

Phys. Rev. B 76, 134513 (2007)

Physics

Condensed Matter

Superconductivity

7 pages, 9 figures

Scientific paper

10.1103/PhysRevB.76.134513

The 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 \sigma band vortices and \pi 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.

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