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Specific heat of 2H-NbSe2 in high magnetic fields

Authors
Berger, H.
Lévy, F.
Published in Physica B: Condensed Matter. 1995, vol. 204, no. 1-4, p. 167-175
Abstract Recently, the unusual behaviour of the specific heat of the superconductors YBa₂Cu₃O₇, Y₂Ba₄Cu₇O₁₅, and YBa₂Cu₄O₈ at high field and low temperature was attributed to Zeeman splitting of localized states in the vortex cores. In an attempt to detect similar effects in classic high-κ superconductors, we have measured the mixed-state specific heat of NbSe₂ single crystals in magnetic fields up to Hc2(0). The specific heat in the superconducting state and zero field is found to follow accurately a strong-coupling model that takes into account the anisotropy of the gap. We analyse then the mixed-state specific heat using the London model. A small Schottky-like excess specific heat remains unexplained. In qualitative agreement with the observations made in Y-Ba-Cu-O, this contribution is suggested to originate from the localized vortex core levels observed by STM techniques.
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SANCHEZ, David et al. Specific heat of 2H-NbSe2 in high magnetic fields. In: Physica B: Condensed Matter, 1995, vol. 204, n° 1-4, p. 167-175. https://archive-ouverte.unige.ch/unige:114636

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Deposited on : 2019-02-28

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