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TT: Fachverband Tiefe Temperaturen
TT 37: Ruthenates
TT 37.2: Talk
Wednesday, March 29, 2023, 15:15–15:30, HSZ 201
High-resolution elastocaloric effect measurement of 110-Sr2RuO4 — •Zhenhai Hu1,2, You-Sheng Li1, Fabian Jerzembeck1, Michael Nicklas1, Andrew P. Mackenzie1,2, and Clifford W. Hicks1,3 — 1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany — 2Scottish Universities Physics Alliance, School of Physics and Astronomy, University of St Andrews, St Andrews, UK — 3School of Physics and Astronomy, University of Birmingham, Birmingham, UK
The symmetry of the order parameter of superconducting Sr2RuO4 remains an undetermined question. Whether the order parameter has more than one component is still under debate. If the superconducting order parameter is degenerate and protected by lattice symmetry, the degeneracy will be lifted when the lattice symmetry is broken. Uniaxial pressure, which can continuously break the lattice symmetry, is thus a powerful tool to distinguish whether there is a degeneracy. However, the second transition was not observed in the previous heat capacity and elastocaloric effect measurements with strain applied along <100>. Although stringent constraints on the nature of superconducting states at zero strain were placed by the absence of the second transition with <100> strain, there remains a possibility that a second transition exists under <110> strain. Here we report the latest progress on elastocaloric measurement of Sr2RuO4 crystal with strain applied along <110>. Within our experimental precision, no signal indicating a second phase transition below Tc is observed.