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APS » Journals » Phys. Rev. Lett. » Volume 65 » Issue 1
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Phys. Rev. Lett. 65, 123–126 (1990)

Test for nonreciprocal circular birefringence in YBa2Cu3O7 thin films as evidence for broken time-reversal symmetry

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S. Spielman, K. Fesler, C. B. Eom, T. H. Geballe, M. M. Fejer, and A. Kapitulnik
Edward L. Ginzton Laboratory and Department of Applied Physics, Stanford University, Stanford, California 94305

Received 10 April 1990; published in the issue dated 2 July 1990

We have measured the amount of nonreciprocal circular birefringence of 50 to 800 Å YBa2Cu3O7 films in transmission with a 15-μm beam diameter. A novel instrument with a sensitivity of 2 μrad for nonreciprocal phase shifts was developed by modifying a fiber-optic gyroscope. It is insensitive to reciprocal phase shifts. We observed no nonreciprocal phase shifts in any samples.

© 1990 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.65.123
DOI:
10.1103/PhysRevLett.65.123
PACS:
74.65.+n
 
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