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Specific heat of 2H-NbSe2 in high magnetic fields

✍ Scribed by D. Sanchez; A. Junod; J. Muller; H. Berger; F. Lévy

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
562 KB
Volume
204
Category
Article
ISSN
0921-4526

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✦ Synopsis

Recently, the unusual behaviour of the specific heat of the superconductors YBa2Cu307, Y2Ba4Cu7015, and YBa2Cu,~O8 at high field and low temperature was attributed to Zeeman splitting of localized states in the vortex cores [D. Sanchez et al., Physica C 200 (1992) 1]. In an attempt to detect similar effects in classic high-x superconductors, we have measured the mixed-state specific heat of NbSe2 single crystals in magnetic fields up to Hcz(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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