We measure specific heat on neutron-irradiated MgB2 samples, whose critical temperature is reduced down to 8.7 K keeping the superconducting transition extremely sharp. The results clearly show the present of two superconducting gap in the range of temperature between 39 and 21 K, whereas a single gap behavior is observed when T-c is lower than 11 K. (c) 2007 Elsevier B.V. All rights reserved.
Observation of the gap merging in neutron irradiated MgB2
Affronte M;Ferdeghini C;Manfrinetti P;Braccini V;Putti M
2007
Abstract
We measure specific heat on neutron-irradiated MgB2 samples, whose critical temperature is reduced down to 8.7 K keeping the superconducting transition extremely sharp. The results clearly show the present of two superconducting gap in the range of temperature between 39 and 21 K, whereas a single gap behavior is observed when T-c is lower than 11 K. (c) 2007 Elsevier B.V. All rights reserved.File in questo prodotto:
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