Theory of Josephson effects in anisotropic superconductors

Journal Article · Tue Jul 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.56.892· OSTI ID:531836

Tanaka, Y ^[1]; Kashiwaya, S ^[2]

---

1. Graduate School of Science and Technology and Department of Physics, Niigata University, Ikarashi, Niigata 950-21 (Japan)
2. Electrotechnical Laboratory, Tsukuba, Ibaraki 305 (Japan)

An analytical formula for the dc Josephson current in anisotropic singlet superconductor/insulator/anisotropic singlet superconductor junctions is presented. The formula is applicable for junctions with arbitrary insulating-potential height and thickness and with any symmetries including d-wave superconductors. In contrast to the formulas for conventional s-wave superconductors, the formula includes two additional effects. One is the intrinsic phase of the pair potential originating from the pairing symmetry in anisotropic superconductors. The other is the formation of localized states around the insulator. Using this formula, the Josephson current is calculated in s-wave superconductor/insulator/d{sub x{sup 2}{minus}y{sup 2}}-wave superconductor (s/I/d) and d{sub x{sup 2}{minus}y{sup 2}}-wave superconductor/insulator/d{sub x{sup 2}{minus}y{sup 2}}-wave superconductor (d/I/d) junction configurations. In the case of the (d/I/d) junction, the anomalous temperature dependence of the maximum Josephson current is calculated. This behavior is completely different from that expected for s-wave superconductors. The validity of a phenomenological theory by Sigrist and Rice [J. Phys. Soc. Jpn. {bold 61}, 4283 (1992)] is also discussed. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 531836
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 2 Vol. 56; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANISOTROPY
JOSEPHSON EFFECT
MATHEMATICAL MODELS
SQUID DEVICES
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS