Effects of density of states on superconductivity

P. M. Hui, David M.T. Kuo

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The effects of the electronic density of states (DOS) on superconductivity are studied within the BCS theory using a one-electron anisotropic tight-binding model for the energy band. By tuning the ratio of the interlayer to intralayer couplings, the model interpolates the two-dimensional and three-dimensional cases. The transition temperature Tc and the isotope effect exponent α are studied as a function of the position of the Fermi energy for various degrees of anisotropy. The transition temperature is highest for uncoupled layers with the Fermi energy near to the logarithmic singularity in the 2D DOS, while the corresponding value of α shows a minimum. As the interlayer coupling is increased, the singularity in the DOS is rounded-off. The enhancement in Tc is suppressed and α approaches the BCS value of 0.5.

Original languageEnglish
Pages (from-to)305-308
Number of pages4
JournalPhysics Letters, Section A: General, Atomic and Solid State Physics
Volume160
Issue number3
DOIs
StatePublished - 18 Nov 1991

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