Inversion symmetry of Josephson current as test of chiral domain wall motion in Sr2RuO4

Kohta Saitoh; Satoshi Kashiwaya; Hiromi Kashiwaya; Yasunori Mawatari; Yasuhiro Asano; Yukio Tanaka; Yoshiteru Maeno

doi:10.1103/PhysRevB.92.100504

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Inversion symmetry of Josephson current as test of chiral domain wall motion in Sr2RuO4

Kohta Saitoh, Satoshi Kashiwaya, Hiromi Kashiwaya, Yasunori Mawatari, Yasuhiro Asano, Yukio Tanaka, Yoshiteru Maeno

DOI 10.1103/PhysRevB.92.100504 · Physical Review B

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Abstract

Clarifying the chiral domain structure of superconducting Sr2RuO4 has been a long-standing issue in identifying its peculiar topological superconducting state. We evaluated the critical current Ic versus the magnetic field H of Nb/Sr2RuO4 Josephson junctions, changing the junction dimension in expectation of that the number of domains in the junction is controlled. Ic(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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.4	Pressure not reported	onset
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown