Phys. Rev. B 73, 134521 (2006) [7 pages]Broadening of the superconducting transition by fluctuations in three-dimensional metals at high magnetic fieldsReceived 25 February 2005; revised 24 January 2006; published 27 April 2006 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 Hc2. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.73.134521
DOI:
10.1103/PhysRevB.73.134521
PACS:
74.40.+k, 74.25.Ha, 74.70.Ad, 74.70.Dd
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