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

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 $T^{\ast }$, 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.

4 pages, 5 figures, submitting to PRL

References in corpus (3)

• High Resolution Polar Kerr Effect Measurements of Sr2RuO4: Evidence for Broken Time Reversal Symmetry in the Superconducting State
• Magnetic order in the pseudogap phase of high-$T_C$ superconductors
• Modified Sagnac interferometer for high-sensitivity magneto-optic measurements atcryogenic temperatures

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