2005/10/26 by H. J. H. Smilde, H.J.H. Smilde, A. A. Golubov +13 · 2 citations
Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic properties of thin films #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevlett.95.257001
4 pages, 3 figures, to be published in Physical Review Letters
arxiv created 2005/10/26 · openalex publication_date 2005/12/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We report on an ab anisotropy of J_c\ensuremath∥b/J_c\ensuremath∥a\ensuremath≅1.8 and IcR_n\ensuremath∥b/IcR_n\ensuremath∥a\ensuremath≅1.2 in ramp-edge junctions between untwinned YBa2Cu3O7 and s-wave Nb. For these junctions, the angle \ensuremathθ with the YBa2Cu3O7 crystal b axis is varied as a single parameter. The RnA(\ensuremathθ) dependence presents twofold symmetry. The minima in IcRn at \ensuremathθ\ensuremath≅50\ifmmode^∘\else\textdegree\fi suggest a real s-wave subdominant component and negligible dxy-wave or imaginary s-wave admixtures. The IcRn(\ensuremathθ) dependence is well fitted by 83% d_x2\ensuremath-y2-, 15% isotropic s-, and 2% anisotropic s-wave order parameter symmetry, consistent with \ensuremathΔb/\ensuremathΔa\ensuremath≅1.5.