Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 51: Focus Session: Broken Time Reversal Symmetry in Multiband Superconductors

TT 51.6: Vortrag

Donnerstag, 4. April 2019, 12:15–12:30, H2

Muon spin relaxation studies of Sr₂RuO₄ under uniaxial stress — •Shreenanda Ghosh¹, Rajib Sarkar¹, Vadim Grinenko¹, Jean-Christophe Orain², Felix Brückner¹, Artem Nikitin², Joonbum Park³, Mark Barber³, Dmitry Sokolov³, Naoki Kikugawa⁴, Jake Bobowski⁵, Yoshiteru Maeno⁶, Hubertus Luetkens², Andrew Mackenzie³, Clifford Hicks³, and Hans-Henning Klauss¹ — ¹Institute for Solid state and Materials Physics, TU Dresden, Gerrmany — ²Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villigen, Switzerland — ³Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ⁴National Institute for Materials Science, Tsukuba, Japan — ⁵University of British Columbia, Canada — ⁶Kyoto University, Japan

To probe its superconducting order parameter, we have performed muon spin relaxation(µSR) measurements on samples of Sr₂RuO₄ placed under uniaxial stress. Previous studies on unstressed Sr₂RuO₄ have revealed enhanced relaxation in the superconducting state, which is interpreted as evidence for a chiral p_x ± ip_y order parameter. With this order parameter, uniaxial stress is expected to induce a splitting between T_c and the onset of chirality. µSR requires large samples, so to perform these measurements. We have developed piezoelectric-based apparatus [1] capable of applying forces of up to ∼ 700 N and using it we have increased T_c from 1.4 K up to 2.1 K. First set of results will be presented, from µSR experiments under different strain.
C. Hicks et al., JPS Conf. Proc. 21, 011040 (2018)