title: Intrinsic d-wave effects in YBa(2)Cu(3)O(7-delta) grain boundary Josephson junctions.
abstract: We have measured the angular dependence of the Josephson critical current density (J(C)) in c-axis tilt biepitaxial grain boundary YBa(2)Cu(3)O(7-delta) junctions. We observe for the first time intrinsic d-wave pairing symmetry effects manifested as an oscillatory dependence of J(C) on angle. This intrinsic effect is evident even though spontaneous currents, possibly induced by faceting or barrier impurities, are observed in the grain boundaries.
authors.affiliation: INFM-Coherentia, Dipartimento Scienze Fisiche, Università di Napoli Federico II, Naples, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Lombardi
authors.forename: F
authors.initials: F
authors.lastname: Tafuri
authors.forename: F
authors.initials: F
authors.lastname: Ricci
authors.forename: F
authors.initials: F
authors.lastname: Miletto Granozio
authors.forename: A
authors.initials: A
authors.lastname: Barone
authors.forename: G
authors.initials: G
authors.lastname: Testa
authors.forename: E
authors.initials: E
authors.lastname: Sarnelli
authors.forename: J R
authors.initials: JR
authors.lastname: Kirtley
authors.forename: C C
authors.initials: CC
authors.lastname: Tsuei