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The search for broken time reversal symmetry (TRSB) in unconventional superconductors intensified in the past
w year as more systems have been predicted to possess such a state. Following our pioneering study of TRSB state
in Sr2RuO4 using magneto-optic probes[2], we embarked on a systematic study of several other system predicted to
be candidate of such novel state. The primary instrument for our studies is the Sagnac magneto-optic interferometer
which we recently developed. This instrument can measure magneto-optc Faraday or Kerr effects with unprecedented
sensitivity of 10 nanorad at temperatures as low as 100 mK [1].
In this talk we will review our recent studies of TRSB in several systems, emphasizing the study of the pseudogap
state of high temperature superconductors [3] and the inverse proximity effect in superconductor/ferromagnet
proximity structures.
[1] Jing Xia, Peter T. Beyersdorf, M. M. Fejer, and Aharon Kapitulnik, Appl. Phys. Lett. 89 (2006), 062508. [2] Jing Xia, Maeno Yoshiteru, Peter T. Beyersdorf, M. M. Fejer, and Aharon Kapitulnik, Phys. Rev. Lett. 97 (2006),167002. [3] Jing Xia, Elizabeth R. Schemm, G. Deutscher, S.A. Kivelson, D.A. Bonn, W.N. Hardy R. Liang, W. Siemons, G. Koster, M.M. Fejer, and A. Kapitulnik, Phys. Rev. Lett. 100 (2008), 127002. |
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