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We report specific heat measurements on neutron-irradiated MgB2 samples, for which the critical\udtemperature is lowered to 8.7 K, but the superconducting transition remains extremely sharp, indicative of\uda defect structure extremely homogeneous. Our results evidence the presence of two superconducting gaps\udin the temperature range above 21 K, while single-gap superconductivity is well established as a bulk\udproperty, not associated with local disorder fluctuations, when Tc decreases to 11 K

physical review letters

Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron-Irradiated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>MgB</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron-IrradiatedMgB2