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TT: Fachverband Tiefe Temperaturen
TT 37: Ruthenates
TT 37.3: Talk
Wednesday, March 29, 2023, 15:30–15:45, HSZ 201
Strain dependence of the superconducting state of Sr2RuO4 under <110> uniaxial pressure: No evidence for multi-component order parameter — •Fabian Jerzembeck1, You-Sheng Li1, Zhenhai Hu1, Naoki Kikugawa2, Dmitry Sokolov1, Yoshiteru Maeno3, Michael Niklas1, Andrew Mackenzie1, and Clifford Hicks4 — 1Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany — 2National Institute for Materials Science, Tsukuba 305-0003, Japan — 3Department of Physics, Kyoto University, Kyoto 606-8502, Japan — 4School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom
After more than 25 years of intense research, the order parameter of the unconventional superconductor Sr2RuO4 is still unknown. Recent experiments suggest that the order parameter is even-parity and multi-component [1,2], which would result in distinct features in the strain dependence of the superconducting state, such as a kink in the strain dependence of Tc around zero strain [3]. Here, we present uniaxial pressure results along the crystallographic <110>-axis and find no evidence for a discontinuity in Tc, predicted for a multi-component order parameter. However, we can place tight constraints on the thermodynamics of several discussed two-component order parameters.
[1] Pustogow et al., Nature 574, 72 (2019)
[2] Ghosh et al., Nat. Phys. 17, 199 (2021)
[3] Kivelson et al., npj Quantum Materials 5, 43 (2020)