Angular dependence of Josephson currents in unconventional superconducting junctions

Abstract

Josephson effect in junctions between unconventional superconductors is studied theoretically within the model describing the effects of interface roughness. The particularly important issue of applicability of the frequently used Sigrist-Rice formula for Josephson current in d-wave superconductor / insulator / d-wave superconductor junctions is addressed. We show that although the SR formula is not applicable in the ballistic case, it works well for rough interfaces when the diffusive normal metal regions exist between the d-wave superconductor and the insulator. It is shown that the SR approach only takes into account the component of the d-wave pair potential symmetric with respect to an inversion around the plane perpendicular to the interface. Similar formula can be derived for general unconventional superconductors with arbitrary angular momentum l.

4 pages, 4 figures

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Cited by in corpus (8)

• What limits supercurrents in high temperature superconductors? A microscopic model of cuprate grain boundaries
• Theory of Macroscopic Quantum Tunneling in High-T_c c-Axis Josephson Junctions
• Theory of Josephson effect in unconventional superconducting junctions with diffusive barriers
• Theory of Josephson effect in chiral p-wave superconductor / diffusive normal metal / chiral p-wave superconductor junctions
• Supercurrent through grain boundaries in the presence of strong correlations
• Cuprate Twistronics for Quantum Hardware
• A quantitative model for IcR product in d-wave Josephson junctions
• Probing interfacial pair breaking in tunnel junctions based on the first and the second harmonics of the Josephson current