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Science 27 August 1999:
Vol. 285. no. 5432, pp. 1373 - 1375
DOI: 10.1126/science.285.5432.1373
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Reports

Temperature Dependence of the Half-Integer Magnetic Flux Quantum

J. R. Kirtley, 1* C. C. Tsuei, 1 K. A. Moler 2

The temperature dependence of the half-integer magnetic flux quantum effect in thin-film tricrystal samples of the high-critical-temperature cuprate superconductor YBa2Cu3O7-delta was measured and found to persist from a temperature of 0.5 kelvin through a critical temperature of about 90 kelvin, with no change in total flux. This result implies that d-wave symmetry pairing predominates in this cuprate, with a small component of time-reversal symmetry breaking, if any, over the entire temperature range.

1 IBM T. J. Watson Research Center, Post Office Box 218, Yorktown Heights, NY 10598, USA.
2 Department of Applied Physics, Stanford University, Stanford, CA 94305, USA.
*   To whom correspondence should be addressed. E-mail: kirtley{at}us.ibm.com

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Science. ISSN 0036-8075 (print), 1095-9203 (online)