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Josephson tunneling in high-$T_c$ superconductors

M. B. Walker·J. Luettmer-Strathmann
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Abstract

This article describes the Josephson tunneling from time-reversal symmetry-breaking states and compares it with that from time-reversal invariant states for both twinned and untwinned crystals and for both $c$-axis and basal-plane currents, in a model for orthorhombic YBCO. A macroscopic invariance group describing the superconducting state of a twinned crystal is introduced and shown to provide a useful framework for the discussion of the results for twinned crystals. In addition, a ring geometry, which allows $s$-wave and $d_{x^2-y^2}$-wave superconductivity in a tetragonal superconductor to be distinguished on the basis of symmetry arguments only, is proposed and analyzed. Finally, an appendix gives details of the experimental Josephson tunneling evidence for a superconducting state of orthorhombic $ux^2+vy^2$ symmetry in YBCO.

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M. B. Walker, J. Luettmer-Strathmann. 1996-04-01. Josephson tunneling in high-$T_c$ superconductors. https://doi.org/10.1103/physrevb.54.588

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