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Broadening of the superconducting transition by fluctuations in three-dimensional metals at high magnetic fields

Maniv, T.; Zhuravlev, V.; Wosnitza, J.; Ignatchik, O.; Bergk, B.; Canfield, P. C.

Abstract

The Bragg-chain model of the two-dimensional (2D) vortex state at high magnetic field [V. N. Zhuravlev and T. Maniv, Phys. Rev. B 60, 4277 (1999)] is extended to an array of coupled superconducting (SC) layers. Application to MgB2 and YNi2B2C yields good quantitative agreement with high-field magnetization measurements, indicating that the smeared transitions observed in these materials are, at least in great part, due to SC fluctuations. Similar to the situation in a 2D system, the melting of the vortex lattice in strongly coupled SC layers is predicted to occur well below the mean field H-c2.

  • Physical Review B 73(2006), 134521

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