We have studied the upper critical field Bc2 in polycrystalline MgB2 samples in which disorder was varied in a controlled way to carry selectively p and s bands from clean to dirty limit. We have found that the clean regime survives when p bands are dirty and s bands are midway between clean and dirty. In this framework we can explain the anomalous behavior of Al doped samples, in which Bc2 decreases as doping increases.
Critical field of MgB2 : crossover from clean to dirty regimes
PUTTI, MARINA;SIRI, ANTONIO;GATTI, FLAVIO;MANFRINETTI, PIETRO;
2004-01-01
Abstract
We have studied the upper critical field Bc2 in polycrystalline MgB2 samples in which disorder was varied in a controlled way to carry selectively p and s bands from clean to dirty limit. We have found that the clean regime survives when p bands are dirty and s bands are midway between clean and dirty. In this framework we can explain the anomalous behavior of Al doped samples, in which Bc2 decreases as doping increases.
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