Sr_2 Ru O_4 : Broken Time-Reversal Symmetry in the Superconducting state

Abstract

Using a phenomenological two-fluid model we derive the Kerr rotation of the polarization direction of reflected light from the surface of a superconductor in a state breaking time-reversal symmetry. We argue that this effect found recently in the superconducting state of $S{r}_{2}Ru{O}_4$ by Xia et al (Phys.Rev.Lett. {\bf 97}, 167002 (2006)) originates from the spontaneous magnetization in this superconductor. The temperature and the frequency dependencies of the effect are established. It is shown that the effect is determined by one of two mechanisms depending on the frequency of light that is larger or smaller than the plasma frequency. The mechanism originating from the gradient of chemical potential created by the electric field of light penetrating into the skin layer and important at frequencies larger than the plasma frequency was missed in the preliminary version of this paper (V.P.Mineev, arXiv:cond-mat/0703624v2).

arXiv comment4 pages, no figures

References in corpus (8)

• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Upper limit on spontaneous supercurrents in Sr${}_2$RuO${}_4$
• Gap Structure of the Spin-Triplet Superconductor Sr2RuO4 Determined from the Field-Orientation Dependence of Specific Heat
• Observation of vortex coalescence in the anisotropic spin-triplet superconductor Sr${}_2$RuO${}_4$
• Theory of the high-frequency chiral optical response in a p_x+ip_y superconductor
• Detailed study of the ac susceptibility of Sr2RuO4 in oriented magnetic fields
• Quasi-classical determination of the in-plane magnetic field phase diagram of superconducting Sr_2RuO_4

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