Theoretical Study on Superconductivity in Boron-Doped Diamond

Details Theoretical Study on Superconductivity in Boron-Doped Diamond Theoretical Study on Superconductivity in Boron-Doped Diamond

2006-10-12

arxiv.org/abs/cond-mat/0610337v2

Physics

Condensed Matter

Superconductivity

9 pages, 13 figures, submitted to J. Phys. Soc. Jpn., Errors in embedded eps figure files have been corrected

Scientific paper

We consider superconductivity in boron (B) doped diamond using a simplified model for the valence band of diamond. We treat the effects of substitutional disorder of B ions by the coherent potential approximation (CPA) and those of the attractive force between holes by the ladder approximation under the assumption of instantaneous interaction with the Debye cutoff. We thereby calculate the quasiparticle life time, the evolution of the single-particle spectra due to doping, and the effect of disorder on the superconducting critical temperature $T_c$. We in particular compare our results with those for supercell calculations to see the role of disorder, which turns out to be of crucial importance to $T_c$.

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