Intrinsic d-Wave Effects in YBa2Cu3O7−δ Grain Boundary Josephson Junctions

F. Lombardi; F. Tafuri; F. Ricci; F. Miletto Granozio; A. Barone; G. Testa; E . Sarnelli; J. R. Kirtley; C. C. Tsuei

doi:10.1103/PhysRevLett.89.207001

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Intrinsic d-Wave Effects in YBa2Cu3O7−δ Grain Boundary Josephson Junctions

F. Lombardi, F. Tafuri, F. Ricci, F. Miletto Granozio, A. Barone, G. Testa, E . Sarnelli, J. R. Kirtley, C. C. Tsuei

DOI 10.1103/PhysRevLett.89.207001 · Physical Review Letters

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Abstract

We have measured the angular dependence of the Josephson critical current density (JC) in c-axis tilt biepitaxial grain boundary YBa2Cu3O7−δ junctions. We observe for the first time intrinsic d-wave pairing symmetry effects manifested as an oscillatory dependence of JC on angle. This intrinsic effect is evident even though spontaneous currents, possibly induced by faceting or barrier impurities, are observed in the grain boundaries.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown