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. 2006 Oct 20;97(16):167002.
doi: 10.1103/PhysRevLett.97.167002. Epub 2006 Oct 20.

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

Jing Xia  1 , Yoshiteru Maeno, Peter T Beyersdorf, M M Fejer, Aharon Kapitulnik
Affiliations

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

Jing Xia et al. Phys Rev Lett. .

Abstract

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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