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Maeno, Even odder after twenty-three years: the superconducting order parameter puzzle of Sr2RuO4, npj Quantum Materials, 2017","review_link":"https://doi.org/10.1038/s41535-017-0045-4","review_verified":"true","summary":"Strontium ruthenate is an exceptionally clean layered oxide that superconducts below 1.5 K; for two decades it was thought to pair electrons with parallel spins, until a 2019 measurement overturned the main evidence. No proposed pairing state now fits all the data.","title":"Order parameter of the superconductor Sr2RuO4","topic_ref":null,"why":"It is the cleanest test of whether experiment can determine an unconventional superconductor's order parameter, and the answer constrains theories of multiorbital 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