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The layered perovskite Ca2RuO4 is a spin-one Mott insulator at ambientpressure and exhibits metallic ferromagnetism at least up to ~ 80 kbar with amaximum Curie temperature of 28 K. Above ~ 90 kbar and up to 140 kbar, thehighest pressure reached, the resistivity and ac susceptibility show pronounceddownturns below ~ 0.4 K in applied magnetic fields of up to ~10 mT. Thisindicates that our specimens of Ca2RuO4 are weakly superconducting on theborder of a quasi-2D ferromagnetic state.

Evidence of superconductivity on the border of quasi-2D ferromagnetism in Ca2RuO4 at high pressure