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要旨:
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 K-2 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+1)Ru(n)O(3n+1) such as Sr2RuO4,
Sr3Ru2O7, and Ca3Ru2O7.
