Competing s-wave and d-wave order in A15 superconductors

Details Competing s-wave and d-wave order in A15 superconductors Competing s-wave and d-wave order in A15 superconductors

2010-02-26

arxiv.org/abs/1002.4892v2

Physics

Condensed Matter

Superconductivity

This paper has been withdrawn by the author due to unsufficient details in the theoretical modelling

Scientific paper

Competing pairing channels have been proposed in superfluid $^3$He, in the high temperature cuprate superconductors, and pnictide superconductors. While strong experimental support exists for this in superfluid $^3$He, the case for superconductors is weaker. Here, we show that $A15$ superconductors provide a compelling example for competing superconducting order. We present microscopic arguments that $A15$ superconductors have a competing d-wave order in addition to usual s-wave superconductivity and show that this d-wave order provides a unifying explanation for a series of diverse experimental results. These include: the emergence of a sharp mode in the superconducting state seen by Raman spectroscopy; the observed shrinking of the vortex core at anomalously low fields; and the large anisotropy measured in the upper critical field. We further show that multiple superconducting gaps can appear when these $A15$ superconductors are strained.

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