Dresden 2017 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 47: Superconductivity: Properties and Electronic Structure 2

TT 47.6: Vortrag

Mittwoch, 22. März 2017, 16:45–17:00, HSZ 103

Heat Capacity Measurements of Sr2RuO4 Under Uni-axial Stress — •You-Sheng Li1,2, Alexandra Gibbs3, Andrew Mackenzie1,2, Clifford Hicks1, and Michael Nicklas11Max 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 px ± ipy. By applying in-plane uniaxial stress, the degeneracy of the px and py components should be lifted, yielding two critical temperatures (Tc). Hicks et al. observed an increase of Tc 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 Tc under compressive strain, providing the first thermodynamic evidence for the strain-induced increase in Tc 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).

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