Anomalous switching in Nb/Ru/Sr2RuO4 topological junctions by chiral domain wall motion

Abstract

A spontaneous symmetry breaking in a system often results in domain wall formation. The motion of such domain walls is utilized to realize novel devices like racetrack-memories, in which moving ferromagnetic domain walls store and carry information. Superconductors breaking time reversal symmetry can also form domains with degenerate chirality of their superconducting order parameter. Sr2RuO4 is the leading candidate of a chiral p-wave superconductor, expected to be accompanied by chiral domain structure. Here, we present that Nb/Ru/Sr2RuO4 topological superconducting-junctions, with which the phase winding of order parameter can be effectively probed by making use of real-space topology, exhibit unusual switching between higher and lower critical current states. This switching is well explained by chiral-domain-wall dynamics. The switching can be partly controlled by external parameters such as temperature, magnetic field and current. These results open up a possibility to utilize the superconducting chiral domain wall motion for future novel superconducting devices.

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• Unsplit superconducting and time reversal symmetry breaking transitions in Sr${}_2$RuO${}_4$ under hydrostatic pressure and disorder
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• Spontaneous superconducting diode effect in non-magnetic Nb/Ru/Sr${}_2$RuO${}_4$ topological junctions
• Inversion symmetry of Josephson current as test of chiral domain wall motion in Sr${}_2$RuO${}_4$
• Constraints on the superconducting state of Sr${}_2$RuO${}_4$ from elastocaloric measurements
• Ferromagnetic SrRuO3 thin-film deposition on a spin-triplet superconductor Sr2RuO4 with highly conducting interface
• Josephson effect in a multi-orbital model for Sr${}_2$RuO${}_4$
• $\mu$SR measurements on Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress
• $T_c$ and the elastocaloric effect of Sr${}_2$RuO${}_4$ under $⟨110⟩$ uniaxial stress: no indications of transition splitting
• Probing chiral superconductivity in Sr${}_2$RuO${}_4$ underneath the surface by point contact measurements
• Observation of superconducting gap spectra of long-range proximity effect in Au/SrTiO${}_3$/SrRuO${}_3$/Sr${}_2$RuO${}_4$ tunnel junctions
• A review of some new perspectives on the theory of superconducting Sr${}_2$RuO${}_4$
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• Characterization of Sr2RuO4 Josephson junctions made of epitaxial films
• Interface currents and magnetization in singlet-triplet superconducting heterostructures: Role of chiral and helical domains
• A Review of Electronic Transport in Superconducting Sr${}_2$RuO${}_4$ Junctions
• Half-quantum vortices on c-axis domain walls in chiral p-wave superconductors
• Anomalous anisotropic behaviour of spin-triplet proximity effect in Au/SrRuO${}_3$/Sr${}_2$RuO${}_4$ junctions
• DC-current induced domain wall in a chiral $p$-wave superconductor