Workshop "NMR, µSR, Mössbauer spectroscopies in the study of Fe-based and other unconventional high-Tc superconductors"
Multigap superconductivity with broken time reversal symmetry in locally non-centrosymmetric SrPtAs
Felix Brückner, TU Dresden, Germany
The recently discovered compound SrPtAs has awakened grown scientific interest, because it comprises an exceptional structural feature: it consists of non-centrosymmetric PtAs layers that are weakly coupled to each other. Theoretical calculations predict an unconventional chiral d-wave superconducting state which is unique in material science.
The evidence for time reversal symmetry breaking was found in µSR experiments. Nuclear quadrupole resonance reveals multigap superconductivity and a fully gapped state. In particular, I present spin-lattice relaxation rate (1/T1) measurements and discuss possible pairing symmetries. These results are relevant to understand the pairing mechanism in this and similar compounds.