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Phys Rev Lett. 2006 Feb 24;96(7):077003. Epub 2006 Feb 23.

Observation of the crossover from two-gap to single-gap superconductivity through specific heat measurements in neutron-irradiated MgB2.

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1
CNR-INFM-LAMIA, Dipartimento di Fisica, Università di Genova, Via Dodecaneso 33, 16146 Genova, Italy.

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.

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