Phys. Rev. Lett. 96, 077003 (2006) [4 pages]
Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron-Irradiated MgB2
Abstract
References (27)
Citing Articles
M. Putti, 1 M. Affronte, 2 C. Ferdeghini, 1 P. Manfrinetti, 1 C. Tarantini, 1 and E. Lehmann31CNR-INFM-LAMIA and Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy
2CNR-INFM-S3 and Dipartimento di Fisica, Università di Modena e Reggio Emilia, Via G. Campi 213/A, I-41100 Modena, Italy
3Paul Scherrer Institut, CH-5232 Villigen, Switzerland
Received 22 July 2005; published 23 February 2006
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.
©2006 The American Physical Society
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