Tunnel junctions of unconventional superconductors
C. Bruder, A. van Otterlo, and G. T. Zimanyi
TL;DR
This paper explores the unique properties of Josephson tunnel junctions between unconventional d-wave superconductors, highlighting their orientation-dependent behavior and distinct I-V characteristics compared to conventional s-wave junctions.
Contribution
It develops a detailed phenomenological model for d-wave superconductor junctions, emphasizing the importance of direction-dependent tunnel matrix elements.
Findings
I-V characteristics differ from s-wave junctions
Thermodynamical properties depend on relative orientation
Full I-V curves are calculated for d-wave junctions
Abstract
The phenomenology of Josephson tunnel junctions between unconventional superconductors is developed further. In contrast to s-wave superconductors, for d-wave superconductors the direction dependence of the tunnel matrix elements that describe the barrier is relevant. We find the full I-V characteristics and comment on the thermodynamical properties of these junctions. They depend sensitively on the relative orientation of the superconductors. The I-V characteristics differ from the normal s-wave RSJ-like behavior.
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