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Gap-to-T c ratio as a function of the Fermi level shift |
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| Authors: | S Ratanaburi P Udomsamuthirun N Saentalard S Yoksan |
| Affiliation: | (1) Department of Physics, Chiangmai University, 50200 Chiangmai, Thailand;(2) Department of Physics, Kasetsart University, 10900 Bangkok, Thailand;(3) Department of Physics, Srinakharinwirot University, 10110 Bangkok, Thailand |
| 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. |
| Keywords: | van Hove singularity gap-ratio high-T c superconductor |
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