Enhanced paramagnetism of the 4d itinerant electrons in the rhodium oxide perovskite SrRhO3

[摘要] Polycrystalline rhodium (IV) oxide perovskite SrRhO3 was obtained by high-pressure synthesis techniques, followed by measurements of the magnetic susceptibility, electrical resistivity, and specific heat. The title compound has five 4d electrons per perovskite unit and shows Fermi-liquid behavior in its electrical resistivity. The magnetic susceptibility is large [chi (300 K)-1.1 x 10(-3) K emu/mol Rh] and proportional to 1/T-2 (<380 K), while there is no magnetic long-range order above 1.8 K. The specific heat measurements indicate a probable magnetic contribution below 15 K, which is not predicted by the self-consistent renormalization theory of spin fluctuations for both antiferro- and ferromagnetic three-dimensional nearly ordered metals.

[关键词] SPIN FLUCTUATIONS;MAGNETIC INSTABILITIES;HEAT;TEMPERATURE;SUSCEPTIBILITY;FIELD