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 σ-band gap, Δσ, evaluated by pointcontact 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 Δσ.
Critical field of Al-doped MgB2 samples: Correlation with the suppression of the s-band gap
PUTTI, MARINA;MANFRINETTI, PIETRO;PALENZONA, ANDREA;
2005-01-01
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 σ-band gap, Δσ, evaluated by pointcontact 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 Δσ.
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