ANISOTROPIC SHEAR STRESS ?xy EFFECTS IN THE BASAL PLANE OF Sr2RuO4 Page No: 4807-4812

By: Pedro Contreras1 and Juan Moreno

Keywords: Shear stress, time-reversal symmetry, ehrenfest relations, elastic constants, thermal expansion

Abstract: In the present paper following the previous work (Walker and Contreras, 2002; Walker, 1980; Walker et al., 2001; Contreras, 2006) we calculate the jumps for the thermal expansion ??xy, the specific heat C?xy, and the elastic compliance ????? ??? in the basal plane of Sr2RuO4. We use here the 4th rank tensor notation because of the Voigt notation, where the stress and strain are treated differently. Henceforth, we clarify some issues regarding a Ginzburg-Landau analysis suitable to explain the sound speed experiments (Lupien, 2002), and partially the strain experiments (Hicks et al., 2014; Steppke et al., 2017) in strontium ruthenate. We continue to propose the following: (1) the discontinuity in the elastic constant Cxyxy of the tetragonal crystal Sr2RuO4 gives an unambiguous experimental evidence that the Sr2RuO4 superconducting order parameter ? has two components with a broken time-reversal symmetry state, and (2) the ? band couples the anisotropic electron-phonon interaction to the [xy] in-plane shear stress in Sr2RuO4 (Walker et al., 2001; Contreras, 2006)



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