Band Filling and Interband Scattering Effects in MgB2: Carbon versus Aluminum Doping

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Kortus, Jens and Dolgov, Oleg V. and Kremer, Reinhard K. and Golubov, Alexander A. (2005) Band Filling and Interband Scattering Effects in MgB2: Carbon versus Aluminum Doping. Physical Review Letters, 94 (2). 027002. ISSN 0031-9007

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Abstract:We argue, based on band structure calculations and the Eliashberg theory, that the observed decrease of Tc of Al and C doped MgB2 samples can be understood mainly in terms of a band filling effect due to the electron doping by Al and C. A simple scaling of the electron-phonon coupling constant ¿ by the variation of the density of states as a function of electron doping is sufficient to capture the experimentally observed behavior. Further, we also explain the long standing open question of the experimental observation of a nearly constant ¿ gap as a function of doping by a compensation of the effect of band filling and interband scattering. Both effects together generate a nearly constant ¿ gap and shift the merging point of both gaps to higher doping concentrations, resolving the discrepancy between experiment and theoretical predictions based on interband scattering only
Item Type:Article
Copyright:© 2005 The American Physical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/52940
Official URL:http://dx.doi.org/10.1103/PhysRevLett.94.027002
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Metis ID: 224970