Superconducting transition temperature for semimetals like bismuth

Srinivasan, S. ; Bhattacharyya, P. ; Jha, Sudhanshu S. (1979) Superconducting transition temperature for semimetals like bismuth Pramana - Journal of Physics, 13 (2). pp. 131-143. ISSN 0304-4289

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The superconducting transition temperature Tc for semimetals like bismuth has been calculated as a function of the density nc of the electron and hole charge carriers. A simplified two-band model for describing the longitudinal dielectric function for such a system has been used in our model calculation. We find that the attractive interaction responsible for the instability of the normal ground state comes not only from the exchange of lattice phonons, but also from the electronhole sound mode, provided the ratio of the averaged hole to electron mass, mh/me ≠ 1. We have compared our theoretical values of Tc (nc) with experimental results for bismuth under hydrostatic pressure, and find reasonable agreement if mh/me is assumed to have a value which is only slightly larger than that at atmospheric pressures. A linear variation of the negative band gap as a function of pressure has been assumed for the sake of this comparison.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Superconductivity; Transition Temperature; Semi-metals; Electron-hole Sound Mechanism
ID Code:66505
Deposited On:24 Oct 2011 09:11
Last Modified:18 May 2016 14:00

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