Bound states and Josephson current in mesoscopic {ital s}-wave superconductor{endash}normal-metal{endash}{ital d}-wave superconductor junctions

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.7354· OSTI ID:383181

Zhu, J; Wang, Z D; Tang, H X ^[1]

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1. Department of Physics, University of Hong Kong, Pokfulam Road (Hong Kong)

We have investigated the superconducting phase difference dependence of Andreev levels and Josephson current through a mesoscopic normal-metal layer in contact with two superconducting electrodes with {ital s}-wave and {ital d}-wave pairing symmetry ({ital S}{sub {ital sNS}}{sub {ital d}} junction). It is shown that, regardless of the junction length, due to the sign change of the {ital d}-wave order parameter under suitable arrangements, the zero-energy point of Andreev levels for the negative process appears at {var_phi}=0. In particular, at zero temperature, the amplitude of the total Josephson current through the point contact {ital S}{sub {ital sNS}}{sub {ital d}} junction could be enhanced by the sign change of the {ital d}-wave order parameter. However, for an {ital S}{sub {ital sNS}}{sub {ital d}} junction of special length, the amplitude of Josephson current may be suppressed by this sign change. Moreover, as a special case, the midgap surface states discovered by Hu [Phys. Rev. Lett. {bold 72}, 1526 (1994)] are recovered naturally. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 383181
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOUND STATE
D WAVES
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
HIGH-TC SUPERCONDUCTORS
S WAVES
SIZE EFFECT
SUPERCONDUCTING JUNCTIONS
SURFACE STATES