Journal
PHYSICAL REVIEW B
Volume 100, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.094530
Keywords
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Funding
- JSPS KAKENHI [JP15H05851, JP15H05852, JP15H05853, JP15H05855, JP15K21717, JP17H02922, 18H01243]
- CREST, JST [JPMJCR16F2]
- Grants-in-Aid for Scientific Research [18H01243] Funding Source: KAKEN
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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.
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