Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 16: Superconductivity: Properties and Electronic Structure II
TT 16.3: Vortrag
Montag, 12. März 2018, 15:30–15:45, H 0110
Heat Capacity Measurements of Sr2RuO4 Under Uni-axial Stress — •You-Sheng Li1,2, Alexandra Gibbs3, Naoki Kikugawa5, Dmitry Sokolov1, Yoshiteru Maeno4, Andrew P. Mackenzie1,2, 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 px and py of the proposed superconducting order parameter px ± ipy 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 px ± ipy superconductivity.