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- Title
Phase dependence of the superconducting current in YBCO Josephson junctions on a bicrystal substrate.
- Authors
Ovsyannikov, G. A.; Borisenko, I. V.; Konstantinyan, K. I.; Mashtakov, A. D.; Stepantsov, E. A.
- Abstract
Dependences of the amplitudes of the harmonic and subharmonic Shapiro steps on an external monochromatic signal were used to study the current-phase dependence of high-temperature superconducting junctions on a bicrystal substrate. It is shown that for a symmetric definition of the transport current across the junction with an edge transparency of the order of &Dmacr; = 10[sup -4] and a mirror-symmetric bicrystal interface, the current-phase dependence is close to sinusoidal which differs from the theoretical predictions and is most likely caused by twinning of the high-temperature superconducting films of the electrodes forming the junction. A departure from symmetry in the definition of the transport current across the junction causes the current-phase dependence to deviate from sinusoidal, which increases with increasing degree of asymmetry. This change in the current-phase dependence is accurately described by a model which takes into account the formation of coupled Andreev states in junctions of superconductors with a d[sub x[sup 2]- y[sup 2]] type of superconducting wave function.
- Subjects
JOSEPHSON junctions; HIGH temperature superconductors; ELECTRODES
- Publication
Technical Physics Letters, 1999, Vol 25, Issue 11, p913
- ISSN
1063-7850
- Publication type
Article
- DOI
10.1134/1.1262682