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Superconductivity in doped sp3 semiconductors: The case of the clathrates

Connétable, Damien and Timoshevskii, Vladimir and Masenelli, B. and Beille, J. and Marcus, J. and Barbara, B. and Saitta, A.M. and Rignanese, G.M. and Mélinon, P. and Yamanaka, S. and Blase, Xavier Superconductivity in doped sp3 semiconductors: The case of the clathrates. (2003) Physicla Review Letters, vol. 91 (n° 24). pp. 247001-247001.

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.91.247001

Abstract

We present a joint experimental and theoretical study of the superconductivity in doped silicon clathrates. The critical temperature in Ba-8@Si-46 is shown to strongly decrease with applied pressure. These results are corroborated by ab initio calculations using MacMillan's formulation of the BCS theory with the electron-phonon coupling constant lambda calculated from perturbative density functional theory. Further, the study of I-8@Si-46 and of gedanken pure silicon diamond and clathrate phases doped within a rigid-band approach show that the superconductivity is an intrinsic property of the sp(3) silicon network. As a consequence, carbon clathrates are predicted to yield large critical temperatures with an effective electron-phonon interaction much larger than in C-60.

Item Type:Article
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Hiroshima University (JAPAN)
Other partners > Institut National Polytechnique de Grenoble (FRANCE)
Other partners > Fondation Nanosciences (FRANCE)
Other partners > Université Pierre et Marie Curie, Paris 6 - UPMC (FRANCE)
Other partners > Université Claude Bernard-Lyon I - UCBL (FRANCE)
Other partners > Université Joseph Fourier Grenoble 1 - UJF (FRANCE)
Other partners > Université Catholique de Louvain - UCL (BELGIUM)
Laboratory name:
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Deposited By: Damien CONNETABLE
Deposited On:23 Mar 2012 09:21

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