Berlin 2018 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 16: Superconductivity: Properties and Electronic Structure II

TT 16.3: Talk

Monday, March 12, 2018, 15:30–15:45, H 0110

Heat Capacity Measurements of Sr₂RuO₄ Under Uni-axial Stress — •You-Sheng Li^1,2, Alexandra Gibbs³, Naoki Kikugawa⁵, Dmitry Sokolov¹, Yoshiteru Maeno⁴, Andrew P. Mackenzie^1,2, Clifford W. Hicks¹, and Michael Nicklas¹ — ¹Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — ²University of St. Andrews, School of Physics and Astronomy, United Kingdom — ³Max Planck Institute for Solid State Research, Stuttgart, Germany — ⁴Department of Physics, Graduate School of Science, Kyoto University, Kyoto, Japan — ⁵Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0003, Japan

We present heat capacity measurements on the superconductor Sr₂RuO₄ under uniaxial stress. Under uniaxial stress, the degeneracy of the components p_x and p_y of the proposed superconducting order parameter p_x ± ip_y should be lifted, resulting in two heat capacity jumps. We have now measured four samples of varying quality, including one where, thanks to high sample quality and careful mounting, the transitions remain very sharp as strain is applied. In measurements up to the peak in Tc (at 3.6 K and a compression of  0.6%), no splitting is observed at any strain. We discuss whether this null result can still be consistent with a hypothesis of p_x ± ip_y superconductivity.