Temperature Dependence of the Half-Integer Magnetic Flux Quantum.

Kirtley, JR; Tsuei, CC; Moler, KA · Science · 1999

basic_science · Level V

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Abstract

The temperature dependence of the half-integer magnetic flux quantum effect in thin-film tricrystal samples of the high-critical-temperature cuprate superconductor YBa(2)Cu(3)O(7-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.