Archivio Istituzionale della RicercaIn this paper, a study of the effect of Al substitution on the upper critical field, B_c2, in Al_xMg_(1−x)B_2 samples is presented. We find a straightforward correlation between B_c2 and the sigma-band gap, Delta_sigma, evaluated by point-contact measurements. Up to x=0.2, B_c2 can be well described within a clean limit model and its decrease with x is directly related to the suppression of Delta_sigma.
Critical field of Al-doped MgB2 samples: Correlation with the suppression of the sigma-band gap / Putti, M.; Ferdeghini, C.; Monni, M.; Pallecchi, I.; Tarantini, C.; Manfrinetti, P.; Palenzona, A.; Daghero, Dario; Gonnelli, Renato; Stepanov, V. A.. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 71:(2005), pp. 144505-1-144505-6. [10.1103/PhysRevB.71.144505]
Critical field of Al-doped MgB2 samples: Correlation with the suppression of the sigma-band gap
DAGHERO, Dario;GONNELLI, Renato;
2005
Abstract
In this paper, a study of the effect of Al substitution on the upper critical field, B_c2, in Al_xMg_(1−x)B_2 samples is presented. We find a straightforward correlation between B_c2 and the sigma-band gap, Delta_sigma, evaluated by point-contact measurements. Up to x=0.2, B_c2 can be well described within a clean limit model and its decrease with x is directly related to the suppression of Delta_sigma.
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https://hdl.handle.net/11583/1400922
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