In this paper, a study of the effect of Al substitution on the upper critical field, Bc2, in AlxMg1-xB2 samples is presented. We find a straightforward correlation between Bc2 and the sigma-band gap, Delta_sigma, evaluated by point-contact measurements. Up to x=0.2, Bc2 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
M Putti;C Ferdeghini;I Pallecchi;P Manfrinetti;
2005
Abstract
In this paper, a study of the effect of Al substitution on the upper critical field, Bc2, in AlxMg1-xB2 samples is presented. We find a straightforward correlation between Bc2 and the sigma-band gap, Delta_sigma, evaluated by point-contact measurements. Up to x=0.2, Bc2 can be well described within a clean limit model and its decrease with x is directly related to the suppression of Delta_sigma.File in questo prodotto:
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