Time-reversal invariant superconductivity of Sr2RuO4 revealed by Josephson effects

Satoshi Kashiwaya; Kohta Saitoh; Hiromi Kashiwaya; Masao Koyanagi; Masatoshi Sato; Keiji Yada; Yukio Tanaka; Yoshiteru Maeno

doi:10.1103/PhysRevB.100.094530

Time-reversal invariant superconductivity of Sr2RuO4 revealed by Josephson effects

Satoshi Kashiwaya, Kohta Saitoh, Hiromi Kashiwaya, Masao Koyanagi, Masatoshi Sato, Keiji Yada, Yukio Tanaka, Yoshiteru Maeno

DOI 10.1103/PhysRevB.100.094530 · Physical Review B

T1

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Abstract

Sr2RuO4 is one of the most promising candidates of a topological superconductor with broken time-reversal symmetry because a number of experiments have revealed evidence for a spin-triplet chiral p-wave superconductivity. To clarify the time-reversal symmetry of Sr2RuO4, we introduce a test that examines the invariance of the Josephson critical current under the inversion of both the current and magnetic fields, in contrast to the detection of a spontaneous magnetic field employed in past experiments. Analyses of the transport properties of the planar and corner Josephson junctions formed between Sr2RuO4 and Nb reveal the time-reversal invariant superconductivity, most probably helical p-wave symmetry, of Sr2RuO4. This state corresponds to a yet-to-be confirmed topological crystalline superconductivity that can host two Majorana edge modes at the surface protected by crystalline mirror symmetry.

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.	1.5	Pressure not reported	unknown