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

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

doi:10.1103/PhysRevB.73.134521

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

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

DOI 10.1103/PhysRevB.73.134521 · Physical Review B

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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 Hc2.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown