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Time Reversal Symmetry Breaking in Unconventional Superconductors

18/11/2013, Aharon Kapitulnik (Stanford University, USA)

In this talk we will survey current searches for time reversal symmetry breaking (TRSB) in unconventional superconductors, concentrating on several classes of systems. Our studies utilize a modified Sagnac interferometer that can measure polar Kerr effect with resolution exceeding 10^-8 rad, which is sensitive to antisymmetric contributions to the real and imaginary parts of the frequency-dependent conductivity tensor. After briefly discussing our earlier studies of Sr2RuO4 (a p-wave superconductor), we will continue to review our recent studies of the heavy fermion superconductors URu2Si2 and UPt3 and discuss their possible pairing symmetry as a result of our measurements. We will also discuss results on hybrid systems involving proximity effect between super conductors and magnetic systems. Finally, we will discuss recent results of Kerr effect measurements in the pseudo gap regime of high-temperature superconductors.