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

Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron Irradiated MgB2 / M., PUTTI; AFFRONTE, Marco; C., FERDEGHINI; P., MANFRINETTI; C., TARANTINI; E., LEHMANN. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 96:(2006), pp. 077003-077007.

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

AFFRONTE, Marco;
2006

Abstract

We report specific heat measurements on neutron-irradiated MgB2 samples, for which the criticaltemperature is lowered to 8.7 K, but the superconducting transition remains extremely sharp, indicative ofa defect structure extremely homogeneous. Our results evidence the presence of two superconducting gapsin the temperature range above 21 K, while single-gap superconductivity is well established as a bulkproperty, not associated with local disorder fluctuations, when Tc decreases to 11 K.
96
077003
077007
Observation of the Crossover from Two-Gap to Single-Gap Superconductivity through Specific Heat Measurements in Neutron Irradiated MgB2 / M., PUTTI; AFFRONTE, Marco; C., FERDEGHINI; P., MANFRINETTI; C., TARANTINI; E., LEHMANN. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 96:(2006), pp. 077003-077007.
M., Putti; Affronte, Marco; C., Ferdeghini; P., Manfrinetti; C., Tarantini; E., Lehmann
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/451620
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