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26 April 2024

» pubmed » pmid16606128

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Observation of the crossover from two-gap to single-gap superconductivity through specific heat measurements in neutron-irradiated MgB2
M Putti ; M Affronte ; C Ferdeghini ; P Manfrinetti ; C Tarantini ; E Lehmann ;
Date:	24 Feb 2006
Journal:	Phys Rev Lett, 96 (7), 077003
Abstract:	We report specific heat measurements on neutron-irradiated MgB2 samples, for which the critical temperature is lowered to 8.7 K, but the superconducting transition remains extremely sharp, indicative of a defect structure extremely homogeneous. Our results evidence the presence of two superconducting gaps in the temperature range above 21 K, while single-gap superconductivity is well established as a bulk property, not associated with local disorder fluctuations, when Tc decreases to 11 K.
Source:	PubMed, pmid16606128
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