Berlin 2015 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 17: Superconductivity: Properties and Electronic Structure
TT 17.7: Vortrag
Montag, 16. März 2015, 16:30–16:45, H 2053
Multigap superconductivity with broken time reversal symmetry in locally noncentrosymmetric SrPtAs — •Felix Brückner1, Hubertus Luetkens2, Hannes Kühne3, Pabitra Kumar Biswas2, Titus Neupert4, Marco Günther1, Rajib Sarkar1, Tobias Stürzer5, Dirk Johrendt5, and Hans-Henning Klauss1 — 1Institut für Festkörperphysik, Technische Universität Dresden, Germany — 2Paul-Scherrer-Institut, Villigen, Switzerland — 3Helmholtz-Zentrum Dresden-Rossendorf, Germany — 4Princeton Center for Theoretical Science, Princeton University, Princeton, USA — 5Ludwig-Maximilians-Universität München, 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. Thus, SrPtAs is a prime example for staggered noncentrosymmetricity. Theoretical calculations predict an unconventional chiral d-wave superconducting state which is unique in material science, but no general consent has been archieved.
The evidence for time reversal symmetry breaking was found in µSR experiments, which implies an unconventional superconducting state. Nuclear quadrupole resonance reveals multigap behavior and a fully gapped superconducting 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. While the fokus is on the experiment, I will discuss the theoretical point of view as well.