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

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

2007-03-24

arxiv.org/abs/cond-mat/0703637v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures

Scientific paper

We 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 $\pi$-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.

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