Dresden 2020 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 41: Unconventional Superconductors
TT 41.5: Talk
Wednesday, March 18, 2020, 16:15–16:30, HSZ 201
Stabilizing even-parity chiral superconductivity in Sr2RuO4 — Han G. Suh1, Henri Menke2, Philip M. R. Brydon2, •Carsten Timm3, Aline Ramires4,5,6, and Daniel F. Agterberg1 — 1Department of Physics, University of Wisconsin, Milwaukee, WI 53201, USA — 2Department of Physics and MacDiarmid Institute for Advanced Materials and Nanotechnology, University of Otago, P.O. Box 56, Dunedin 9054, New Zealand — 3Institute of Theoretical Physics, Technische Universität Dresden, 01062 Dresden, Germany — 4Max Planck Institute for the Physics of Complex Systems, Dresden, 01187, Germany — 5ICTP-SAIFR, International Centre for Theoretical Physics, South American Institute for Fundamental Research, Sao Paulo, SP, 01140-070, Brazil — 6Instituto de Fisica Teorica, Universidade Estadual Paulista, Sao Paulo, SP, 01140-070, Brazil
Sr2RuO4 has long been thought to host a spin-triplet chiral p-wave superconducting state. However, the singlet-like response observed in recent Knight shift measurements casts serious doubts on this pairing state. The available experimental results seem to point towards an even-parity chiral superconductor, a pairing state which has been systematically neglected given the quasi-2D electronic structure of Sr2RuO4. Here we show how the orbital degree of freedom can encode the two component nature of the Eg order parameter, allowing for an s-wave orbital-antisymmetric spin-triplet state which can be stabilized by Hund’s coupling.