Difference between Al and C doping in anisotropic upper critical field development in MgB2

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2005-04-01
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Angst, M.
Bud'ko, Sergey L.
Wilke, R. H. T.
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American Physical Society
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Canfield, Paul
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Abstract
The temperature dependence of the upper critical field H-c2 for both field directions in partially substituted polycrystalline MgB2 was determined. Whereas the suppression of T-c is similar for aluminum and carbon substituted samples, H-c2 is affected by the substitution in profoundly different ways. In the case of Al substitution changes can tentatively be described by intrinsic effects (shift of the Fermi level). In the C substituted samples, H-c2 is increased drastically, and extrinsic effects (disorder) have to play a major role. The strong contrast between the two substitutions is discussed, taking into account three relevant scattering rates.
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This article is published as Angst, M., S. L. Bud’ko, R. H. T. Wilke, and P. C. Canfield. "Difference between Al and C doping in anisotropic upper critical field development in Mg B 2." Physical Review B 71, no. 14 (2005): 144512. DOI: 10.1103/PhysRevB.71.144512. Copyright 2005 American Physical Society. Posted with permission.
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