Polar Kerr-effect measurements of the high-temperature YBa2Cu3O6+x superconductor: Evidence for broken symmetry near the pseudogap temperature

Jing Xia, Elizabeth Schemm, G. Deutscher, S.A. Kivelson, D.A. Bonn, W.N. Hardy, R. Liang, W. Siemons, Gertjan Koster, M.M. Fejer, A. Kapitulnik

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The polar Kerr effect in the high-Tc superconductor YBa2Cu3O6+x was measured at zero magnetic field with high precision using a cyogenic Sagnac fiber interferometer. We observed nonzero Kerr rotations of order ~1 µrad 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.
Original languageUndefined
Pages (from-to)127002-
Number of pages4
JournalPhysical review letters
Issue number12
Publication statusPublished - 2008


  • METIS-252601
  • IR-59281

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