Inversion symmetry of Josephson current as test of chiral domain wall motion in Sr${}_2$RuO${}_4$

Abstract

Clarifying the chiral domains structure of superconducting Sr${}_2$RuO${}_4$ has been a long-standing issue in identifying its peculiar topological superconducting state. We evaluated the critical current $I_c$ versus the magnetic field $H$ of Nb/Sr${}_2$RuO${}_4$ Josephson junctions, changing the junction dimension in expectation of that the number of domains in the junction is controlled. $I_c(H)$ exhibits a recovery from inversion symmetry breaking to invariance when the dimension is reduced to several microns. This inversion invariant behavior indicates the disappearance of domain walls; thus, the size of a single domain is estimated at approximately several microns.

5 pages, 4 figures, accepted for publication in Phys. Rev. B: Rapid communications

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• Possible three-dimensional nematic odd-parity superconductivity in Sr${}_2$RuO${}_4$
• Multi-component order parameter superconductivity of Sr${}_2$RuO${}_4$ revealed by topological junctions
• Constraints on the superconducting state of Sr${}_2$RuO${}_4$ from elastocaloric measurements
• Josephson effect in a multi-orbital model for Sr${}_2$RuO${}_4$
• A review of some new perspectives on the theory of superconducting Sr${}_2$RuO${}_4$
• Characterization of Sr2RuO4 Josephson junctions made of epitaxial films
• Half-quantum vortices on c-axis domain walls in chiral p-wave superconductors
• Anomalous Fraunhofer-like patterns in quantum anomalous Hall Josephson junction
• DC-current induced domain wall in a chiral $p$-wave superconductor
• Helly-type theorem for eigenvectors