Large Broadening of the Superconducting Transition by Fluctuations in a 3D Metal at High Magnetic Fields: The MgB2 case
T. Maniv, V. Zhuravlev
Abstract
It is shown that the transition to the low temperature superconducting state in a 3D metal at high magnetic field is smeared dramatically by thermal fluctuation of the superconducting order parameter. The resulting superconducting-to-normal crossover occurs in a vortex liquid state which is extended well below the mean-field Hc2. Application to MgB2 yields good quantitative agreement with recently reported data of dHvA oscillation in the superconducting state.
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