Transport properties, thermodynamic properties, and electronic structure ofSrRuO3

Abstract

${\mathrm{SrRuO}}_{3}$ is a metallic ferromagnet. Its electrical resistivity is reported for temperatures up to 1000 K, its Hall coefficient for temperatures up to 300 K, and its specific heat for temperatures up to 230 K. The energy bands have been calculated by self-consistent spin-density functional theory, which finds a ferromagnetic ordered moment of 1.45${\mathrm{\ensuremath{\mu}}}_{\mathit{B}}$ per Ru atom. The measured linear specific heat coefficient \ensuremath{\gamma} is 30 mJ/mol, which exceeds the theoretical value by a factor of 3.7. A transport mean free path at room temperature of \ensuremath{\approxeq}10 \AA{} is found. The resistivity increases nearly linearly with temperature to 1000 K in spite of such a short mean free path that resistivity saturation would be expected. The Hall coefficient is small and positive above the Curie temperature, and exhibits both a low-field and a high-field anomalous behavior below the Curie temperature. \textcopyright{} 1996 The American Physical Society.