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Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron Irradiated MgB2

Authors
  • Putti, M.
  • Affronte, M.
  • Ferdeghini, C.
  • Tarantini, C.
  • Lehmann, E.
Type
Preprint
Publication Date
Aug 24, 2005
Submission Date
Aug 24, 2005
Identifiers
DOI: 10.1103/PhysRevLett.96.077003
arXiv ID: cond-mat/0508582
Source
arXiv
License
Unknown
External links

Abstract

We report specific heat measurements in neutron irradiated MgB2 samples, for which the critical temperature has been suppressed down to 8.5 K, but the superconducting transition remains extremely sharp, indicative of a defect structure extremely homogeneous. Our results demonstrate that the two-gap feature is evident in the temperature range above 21 K, while the single-gap superconductivity is well established as a bulk property not associated to local disorder fluctuations when Tc is decreased down to 11 K.

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