Dresden 2017 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 47: Superconductivity: Properties and Electronic Structure 2

TT 47.6: Talk

Wednesday, March 22, 2017, 16:45–17:00, HSZ 103

Heat Capacity Measurements of Sr₂RuO₄ Under Uni-axial Stress — •You-Sheng Li^1,2, Alexandra Gibbs³, Andrew Mackenzie^1,2, Clifford 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

One of the most-discussed possible pairing symmetries of the superconductor Sr₂RuO₄ is p_x ± ip_y. By applying in-plane uniaxial stress, the degeneracy of the p_x and p_y components should be lifted, yielding two critical temperatures (T_c). Hicks et al. observed an increase of T_c of Sr₂RuO₄ under both compressive and tensile stress [1], and did not find evidence for splitting of transition. However, that result was based on magnetic susceptibility measurements, which would be sensitive only to the upper transition. For a direct test of possible splitting, we measure the heat capacity of Sr₂RuO₄ under uniaxial stress. To do so, we have developed an approach to measure heat capacity under non-adiabatic conditions. We have observed the increase in T_c under compressive strain, providing the first thermodynamic evidence for the strain-induced increase in T_c of Sr₂RuO₄, and also resolve strong strain-induced changes in the normal-state heat capacity.

[1] Clifford W. Hicks et al., Science 344, 283 (2014).