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Evidence for broken time-reversal symmetry in the superconducting phase of URu$_2$Si$_2$

Recent experimental and theoretical interest in the superconducting phase of the heavy fermion material URu$_2$Si$_2$ has led to a number of proposals in which the superconducting order parameter breaks time-reversal symmetry (TRS). In this study we measured polar Kerr effect (PKE) as a function of temperature for several high-quality single crystals of URu$_2$Si$_2$. We find an onset of PKE below the superconducting transition that is consistent with a TRS-breaking order parameter. This effect appears to be independent of an additional, possibly extrinsic, PKE generated above the hidden order transition at $T_{HO}=17.5$ K, and contains structure below $T_c$ suggestive of additional physics within the superconducting state.

preprint2015arXivOpen access
E. R. SchemmR. E. BaumbachP. H. TobashF. RonningE. D. BauerA. Kapitulnik
cond-mat.supr-con
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E. R. SchemmR. E. BaumbachP. H. TobashF. RonningE. D. BauerA. Kapitulnik

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