Abstract
The presence or absence of the half-integer flux quantum effect in controlled orientation tricrystal grain boundary rings is a general test of the phase of the superconducting order parameter. One such test proves that this effect is symmetry dependent, and that the order parameter in YBa2Cu3O7-ς has lobes and nodes consistent with d-wave symmetry. Our measurements show that the flux in the 1/2 integer ground state is quantized to Φ0/2 within ± 3%. This puts limits on the imaginary component of the superconducting order parameter in YBa2Cu3O7-ς.
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Kirtley, J.R., Tsuei, C.C., Sun, J.Z. et al. Symmetry tests using the half-integer flux quantum effect in cuprate superconducting rings. J Supercond 8, 487–490 (1995). https://doi.org/10.1007/BF00722837
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DOI: https://doi.org/10.1007/BF00722837