Highly anisotropic supercurrent transport in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} bicrystal Josephson junctions

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.602· OSTI ID:573799

Ivanov, Z G; Stepantsov, E A; Claeson, T ^[1]; Wenger, F ^[2]; Lin, S Y; Khare, N; Chaudhari, P ^[3]

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1. Department of Microelectronics and Nanoscience, MINA, Chalmers University of Technology and University of Goeteborg, S-412 96 Goeteborg (Sweden)
2. Institute of Theoretical Physics, Chalmers University of Technology, S-412 96 Goeteborg (Sweden)
3. IBM, Thomas J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 (United States)

We report tunneling measurements on a large number of bicrystal YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} Josephson junctions. The orientations of the bicrystals relative to their boundary was varied over 80{degree} while the misorientation angle was kept fixed at 32{degree}. A strong anisotropy in the characteristic voltage I{sub c}R{sub n} of the Josephson junctions in the a-b plane was observed. I{sub c}R{sub n}{close_quote}s varied from about 80 to 2300 {mu}V 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 d{sub x{sup 2}{minus}y{sup 2}} wave, and anisotropy of the tunneling matrix elements. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 573799
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 1 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
COPPER OXIDES
CRITICAL CURRENT
CURRENT DENSITY
ENERGY GAP
JOSEPHSON JUNCTIONS
TUNNEL EFFECT
YTTRIUM OXIDES