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. [10.1103/PhysRevLett.96.077003]
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.
| File | Dimensione | Formato | |
|---|---|---|---|
|
PRL MgB2.pdf
Accesso riservato
Tipologia:
Versione dell'autore revisionata e accettata per la pubblicazione
Dimensione
214.66 kB
Formato
Adobe PDF
|
214.66 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris
