Evidence for a non-{ital s}-wave superconducting order parameter in YBa{sub 2}Cu{sub 3}O{sub 6.6} with {ital T}{sub {ital c}}=60 K
- Laboratorium fuer Festkoerperphysik, Eidgenoessische Technische Hochschule--Hoenggerberg, CH-8093 Zuerich (Switzerland)
Several recent phase-sensitive-tunneling experiments have indicated that YBa{sub 2}Cu{sub 3}O{sub 6.9} is not an {ital s}-wave superconductor. In this work we report an analogous experiment on a related cuprate superconductor, YBa{sub 2}Cu{sub 3}O{sub 6.6}, with {ital T}{sub {ital c}}=60 K. The critical current vs applied field of a Pb-YBa{sub 2}Cu{sub 3}O{sub 6.6} single crystal corner Josephson junction is measured and compared with the theory. As a control experiment, measurements are made on a Pb-YBa{sub 2}Cu{sub 3}O{sub 6.6} edge junction. The results are consistent with a {ital d}-wave order parameter for YBa{sub 2}Cu{sub 3}O{sub 6.6}. It is thus unlikely that the results of previous similar experiments on almost fully oxygenated YBa{sub 2}Cu{sub 3}O{sub 6.6} may simply be explained by the presence of the Cu-O chains. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 279795
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 53, Issue 13; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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