Misc,

Time-Reversal-Symmetry-Broken Superconductivity in Locally Non-Centrosymmetric SrPtAs

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(2012)cite arxiv:1212.2441 Comment: 5 pages, 5 figures.

Abstract

We report the magnetic and superconducting properties of locally non-centrosymmetric SrPtAs obtained by muon-spin-rotation/relaxation (muSR) measurements. Zero-field muSR reveals the occurrence of spontaneous static magnetic fields below the superconducting transition temperature. This finding implies that the superconducting state of SrPtAs breaks time-reversal symmetry. The superfluid density as determined by transverse field muSR is exponentially flat approaching T=0K proving the absence of extended nodes in the gap function. These experimental results enable us to identify the complex d+id (chiral d-wave) order parameter as the most probable pairing state in SrPtAs allowed by symmetry.

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