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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity - Poster Session

TT 30.14: Poster

Monday, March 31, 2014, 15:00–19:00, P2

Multigap superconductivity in locally non-centrosymmetric SrPtAs as revealed by nuclear quadrupole resonance — •Felix Brückner¹, Rajib Sarkar¹, Marco Günther¹, Hans-Henning Klauss¹, Hannes Kühne², Hubertus Luetkens³, Pabitra Biswas³, and Titus Neupert⁴ — ¹Technische Universität Dresden, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ³Paul Scherrer Institut, Villigen, Switzerland — ⁴Princeton University, Princeton, USA

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.

This is in line with evident breaking of time reversal symmetry in µSR experiments.

Our nuclear quadrupole resonance experiments reveal multigap superconductivity and a fully gapped state. In particular, we 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.