Polar Kerr Effect from Time-Reversal Symmetry Breaking in the Heavy-Fermion Superconductor PrOs4Sb12

E. M. Levenson-Falk, E. R. Schemm, Y. Aoki, M. B. Maple, A. Kapitulnik
2018 Physical Review Letters  
We present polar Kerr effect measurements of the filled skutterudite superconductor PrOs_4Sb_12. Simultaneous AC susceptibility measurements allow us to observe the superconducting transition under the influence of heating from the optical beam. A nonzero Kerr angle θ_K develops below the superconducting transition, saturating at ∼ 300 nrad at low temperatures. This result is repeated across several measurements of multiple samples. By extrapolating the measured θ_K(T) to zero optical power, we
more » ... are able to show that the Kerr angle onset temperature in one set of measurements is consistent with the transition to the B phase at T_C2. We discuss the possible explanations for this result and its impact on the understanding of multi-phase and inhomogeneous superconductivity in PrOs_4Sb_12.
doi:10.1103/physrevlett.120.187004 pmid:29775372 fatcat:izzev7xbzja6xf36gkyk5indiy