Physical Properties of Single-Crystalline CaRuO₃ Grown by a Floating-Zone Method

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We report the successful growth of single crystals of the perovskite ruthenate CaRuO₃ by a floating-zone method, and characterization of their physical properties by x-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat. Although the system is strongly correlated, with an electronic specific heat coefficient of approximately 80 mJ/(mol K² Ru), the physical properties are nearly isotropic, reflecting the almost cubic crystal structure. No obvious phase transitions are observed down to 0.12 K, in contrast to observations on other metallic ruthenates with the Ruddlesden–Popper type layered perovskite structure A_n+1Ru_nO_3n+1 such as Sr₂RuO₄, Sr₃Ru₂O₇, and Ca₃Ru₂O₇.