Superconductivity in heavily boron-doped carbon materials
ORAL
Abstract
We investigate the superconducting properties of heavily boron-doped carbon materials composed of sp3 hybridized atoms: cubic diamond, hexagonal diamond, and body centered tetragonal C4 (bct C4). We find that a high density of states (DOS) at the Fermi energy result in a high superconducting transition temperature (Tc) in all three materials. The high DOS is particularly realized when boron dopants are not placed at nearest neighbor sites. A Tc above 60 K can be obtained for cubic diamond, although other allotropes can exhibit a Tc of 40-50 K at 25 % boron-doping. We also discuss superconductivity in amorphous carbon.
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Presenters
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Yuki Sakai
University of Texas at Austin, Oden Institute for Computational Engineering and Sciences, University of Texas at Austin
Authors
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Yuki Sakai
University of Texas at Austin, Oden Institute for Computational Engineering and Sciences, University of Texas at Austin
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James Chelikowsky
University of Texas at Austin, Department of Physics, University of Texas at Austin
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Marvin L Cohen
University of California, Berkeley, Department of Physics, University of California at Berkeley