Polar Kerr Effect as Probe for Time-Reversal Symmetry Breaking in Unconventional Superconductors

Details Polar Kerr Effect as Probe for Time-Reversal Symmetry Breaking in Unconventional Superconductors Polar Kerr Effect as Probe for Time-Reversal Symmetry Breaking in Unconventional Superconductors

2009-06-16

arxiv.org/abs/0906.2845v1

New J. Phys. 11, 055060 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

A review paper

Scientific paper

The search for broken time reversal symmetry (TRSB) in unconventional superconductors intensified in the past year as more systems have been predicted to possess such a state. Following our pioneering study of TRSB states in Sr$_2$RuO$_4$ using magneto-optic probes, we embarked on a systematic study of several other of these candidate systems. The primary instrument for our studies is the Sagnac magneto-optic interferometer, which we recently developed. This instrument can measure magneto-optic Faraday or Kerr effects with an unprecedented sensitivity of 10 nanoradians at temperatures as low as 100 mK. In this paper we review our recent studies of TRSB in several systems, emphasizing the study of the pseudogap state of high temperature superconductors and the inverse proximity effect in superconductor/ferromagnet proximity structures.

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