![]() High resolution polar Kerr effect measurements of Sr 2RuO 4: evidence for broken time-reversal symmetry in the superconducting state. Time-reversal symmetry-breaking superconductivity in Sr 2RuO 4. ![]() Evaluation of spin-triplet superconductivity in Sr 2RuO 4. Maeno, Y., Kittaka, S., Nomura, T., Yonezawa, S. Even odder after twenty-three years: the superconducting order parameter puzzle of Sr 2RuO 4. The superconductivity of Sr 2RuO 4 and the physics of spin-triplet pairing. Superconductivity in a layered perovskite without copper. In addition, we report the appearance of bulk magnetic order under higher uniaxial stress, above the critical pressure at which a Lifshitz transition occurs in Sr 2RuO 4. We observe stress-induced splitting between the onset temperatures of superconductivity and time-reversal symmetry breaking-consistent with the qualitative expectations for a chiral order parameter-and argue that this observation cannot be explained by conventional magnetism. Here we report the measurement of zero-field muon spin relaxation-a probe sensitive to weak magnetism-on samples under uniaxial stresses. Therefore, a definitive resolution of whether the superconductivity of Sr 2RuO 4 is chiral is important for the study of superconductivity. There is evidence that its order parameter is chiral, but reconciling this with recent observations of the spin part of the pairing requires an order parameter that is either finely tuned or implies a new form of pairing. ![]() Strontium ruthenate (Sr 2RuO 4) continues to present an important test of our understanding of unconventional superconductivity, because while its normal-state electronic structure is known with precision, its superconductivity remains unexplained. Nature Physics volume 17, pages 748–754 ( 2021) Cite this article Split superconducting and time-reversal symmetry-breaking transitions in Sr 2RuO 4 under stress
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