Tests for Nonreciprocal Optical Effects in High-Temperature Superconductors
The existance of spontanous polar Kerr effect and Faraday effect in High-Tc films and crystals was tested using a Sagnac interferometer. Observation of these effects would be a strong evidence that the superconductivity in the cuprates is described by a theory that predicts broken time-reversal symmetry. No evidense of either polar Kerr rotation or Faraday effects were found when the data was analyzed for both a spatially fluctuating component (anticipating domains) and an absolute offset. The measurements were done with averaged sensitivity of less than 3μrad.
KeywordsSugar Magnesia Refraction Coupler Grease
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