Highly anisotropic supercurrent transport in YBa2Cu3O7−δ bicrystal Josephson junctions

Z. G. Ivanov; E. A. Stepantsov; T. Claeson; F. Wenger; S. Y. Lin; N. Khare; P. Chaudhari

doi:10.1103/PhysRevB.57.602

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Highly anisotropic supercurrent transport in YBa2Cu3O7−δ bicrystal Josephson junctions

Z. G. Ivanov, E. A. Stepantsov, T. Claeson, F. Wenger, S. Y. Lin, N. Khare, P. Chaudhari

DOI 10.1103/PhysRevB.57.602 · Physical Review B

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Abstract

We report tunneling measurements on a large number of bicrystal YBa2Cu3O7−δ Josephson junctions. The orientations of the bicrystals relative to their boundary was varied over 80° while the misorientation angle was kept fixed at 32°. A strong anisotropy in the characteristic voltage IcRn of the Josephson junctions in the a−b plane was observed. IcRn’s varied from about 80 to 2300 μV at 4 K. The theoretical analysis shows that this variation may be explained as a combined effect of the presence of nodes in the gap function, either a generalized s wave with eight nodes or a dx2−y2 wave, and anisotropy of the tunneling matrix elements.

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 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown