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Polar Kerr Effect Measurements of YBa2Cu3O6+x: Evidence for Broken Symmetry Near the Pseudogap Temperature

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arxiv 0711.2494 v2 pith:XYCOB32U submitted 2007-11-15 cond-mat.supr-con

Jing Xia , Elizabeth Schemm , G. Deutscher , S.A. Kivelson , D. A. Bonn , W. N. Hardy , R. Liang , W. Siemons
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G. Koster M. M. Fejer A. Kapitulnik
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classification cond-mat.supr-con
keywords effectkerrtemperaturebrokenmagneticnearpolarpseudogap
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abstract

Polar Kerr effect in the high-Tc superconductor \YBCO was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed non-zero Kerr rotations of order $\sim 1 \mu$rad appearing near the pseudogap temperature $T^*$, and marking what appears to be a true phase transition. Anomalous magnetic behavior in magnetic-field training of the effect suggests that time reversal symmetry is already broken above room temperature.

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