Abstract
Within the framework of the BCS theory, the gap-to-TC ratioR=2‡ 0/kTc is evaluated numerically (‡0 is the energy gap atT = 0 andT> c is the critical temperature) for a superconductor with a van Hove singularity (vHs) in the density of states as a function of the shifts (δ) of the Fermi level with respect to the vHs. It is found thatR varies asymmetrically with δ and that the variations are strong near δ = 0. Our numerical calculation shows that the largest R’s occur at certain values of δ⊋0.
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Ratanaburi, S., Udomsamuthirun, P., Saentalard, N. et al. Gap-to-T c ratio as a function of the Fermi level shift. J Supercond 10, 1–2 (1997). https://doi.org/10.1007/BF02763941
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DOI: https://doi.org/10.1007/BF02763941