Temperature Dependence of the Half-Integer Magnetic Flux Quantum

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Science  27 Aug 1999:
Vol. 285, Issue 5432, pp. 1373-1375
DOI: 10.1126/science.285.5432.1373

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The temperature dependence of the half-integer magnetic flux quantum effect in thin-film tricrystal samples of the high-critical-temperature cuprate superconductor YBa2Cu3O7–δ 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.

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