Abstract
It is shown that d-wave superconductivity can lead to frustration in a multiply-connected superconducting system involving Josephson junctions. This frustration is responsible for various unusual magnetic properties in some high-temperature superconductors. Various test experiments for d-wave superconductivity are discussed, especially the direct observation of spontaneous currents due to frustration. Recent experiments finding fractional vortices in YBCO are interpreted as evidence for time-reversal breaking superconductivity.
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