High resolution polar Kerr effect measurements of Sr2RuO4: evidence for broken time-reversal symmetry in the superconducting state.

@article{Xia2006HighRP,
  title={High resolution polar Kerr effect measurements of Sr2RuO4: evidence for broken time-reversal symmetry in the superconducting state.},
  author={Jing Xia and Yoshiteru Maeno and Peter T. Beyersdorf and M. M. Fejer and Aharon Kapitulnik},
  journal={Physical review letters},
  year={2006},
  volume={97 16},
  pages={167002}
}
The polar Kerr effect in the spin-triplet superconductor Sr2RuO4 was measured with high precision using a Sagnac interferometer with a zero-area Sagnac loop. We observed nonzero Kerr rotations as big as 65 nanorad appearing below Tc in large domains. Our results imply a broken time-reversal symmetry state in the superconducting state of Sr2RuO4, similar to 3He-A. 
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