P. K. Biswas, H. Luetkens, T. Neupert, T. Stuerzer, C. Baines, G. Pascua, A. P. Schnyder, M. H. Fischer, J. Goryo, M. R. Lees, H. Maeter, H. -H. Klauss, M. Sigrist, A. Amato, D. Johrendt
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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http://arxiv.org/abs/1212.2441
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