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

Patricia L. Alireza , Fumihiko Nakamura , Swee K. Goh , Yoshiteru Maeno , Satoru Nakatsuji , Y. T. Chris Ko , Michael Sutherland , Stephen Julian

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Gilbert G. Lonzarich

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classification ❄️ cond-mat.supr-con cond-mat.str-el

keywords ca2ruo4kbarpressureborderferromagnetismquasi-2daboveambient

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

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

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