Polar Kerr-effect measurements of the high-temperature YBa2Cu3O6+x superconductor: evidence for broken symmetry near the pseudogap temperature |
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| Authors: | Xia Jing Schemm Elizabeth Deutscher G Kivelson S A Bonn D A Hardy W N Liang R Siemons W Koster G Fejer M M Kapitulnik A |
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| Institution: | Department of Physics, Stanford University, Stanford, California 94305, USA. |
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| Abstract: | The polar Kerr effect in the high-T_(c) 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 approximately 1 microrad 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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