Visualised predictions of gap anisotropy to test new electron pairing scheme

X.H. Zheng, D.G. Walmsley

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Abstract

The rich and fertile but not yet adequately exploited ground of superconductor anisotropy is proposed as a test bed for a new empirical scheme of electron pairing. The scheme is directed to resolving a numerical and conceptual difficulty in the BCS theory. The original theoretical formulation of the anisotropy problem by Bennett is adopted and its outcomes extensively explored. Here the Bennett conclusion that in metallic superconductors phonon anisotropy is the principal source of gap anisotropy is accepted. Values of the energy gap are visualised globally in k-space with unprecedented detail and accuracy. Comparison is made between the anisotropy pattern from the new and the usual BCS pairing schemes. Differences are revealed for future experimental resolution.
Original languageEnglish
Pages (from-to)19-28
Number of pages10
JournalPhysica C: Superconductivity and its Applications
Volume534
Early online date27 Dec 2016
DOIs
Publication statusPublished - 15 Mar 2017

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Keywords

  • superconductor, Eliashberg, tunneling, energy gap, anisotropy

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