Regensburg 2016 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 6: Superconductivity: Properties and Electronic Structure

TT 6.3: Vortrag

Montag, 7. März 2016, 10:30–10:45, H19

Heat Capacity Measurements of Sr₂RuO₄ under uni-axial Strain — •You-sheng Li^1,2, Alexandra Gibbs³, Clifford Hicks¹, Andrew Mackenzie^1,2, and Michael Nicklas² — 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 Sr₂RuO₄ is p_x ± ip_y. By applying strain along ⟨ 100 ⟩-direction, the degeneracy of the p_x and p_y components is lifted, and thus there should be two critical temperatures (T_c). Hicks et al. [1] have observed an increase of T_c of Sr₂RuO₄ under both compressive and tensile strains, by measuring the susceptibility, which is sensitive only to the first transition. Their results also indicate, indirectly, that any splitting of T_cs might be small. For a direct test of possible splitting, we measure the heat capacity of Sr₂RuO₄ under strain. To do so, we are developing an approach to measure heat capacity under non-adiabatic conditions. We have observed an increase of T_c under compressive strain. This is the first thermodynamic evidence of the strain-induced increase in T_c of Sr₂RuO₄.
C. W. Hicks et al., Science 344, 283 (2014).