Large Broadening of the Superconducting Transition by Fluctuations in a 3D Metal at High Magnetic Fields: The MgB${}_2$ case

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 $H_{c2}$. Application to MgB${}_2$ yields good quantitative agreement with recently reported data of dHvA oscillation in the superconducting state.

References in corpus (6)

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• Supercooled vortex liquid and quantitative theory of melting of the flux line lattice in type II superconductors
• Damping of the de Haas-van Alphen oscillations in the superconducting state of MgB_2
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Cited by in corpus (5)

• de Haas-van Alphen effect investigations of the electronic structure of pure and aluminum-doped MgB_2
• Exact analytic Gorkov-Ginzburg-Landau theory of type-II superconductivity in the magneto-quantum oscillations limit
• Damping of dHvA oscillations and vortex-lattice disorder in the peak-effect region of strong type-II superconductors
• 2D Weyl Fermi gas model of Superconductivity in the Surface state of a Topological Insulator at High Magnetic fields
• Double-stage continuous-discontinuous superconducting phase transition in the Pauli paramagnetic limit of a 3D superconductor: the URuSi${}_2$ case