Transport Properties, Thermodynamic Properties, and Electronic Structure of SrRuO3

TL;DR

This study investigates the electrical, thermodynamic, and electronic properties of SrRuO3, revealing its metallic ferromagnetic nature, unusual resistivity behavior at high temperatures, and detailed electronic structure insights.

Contribution

The paper provides comprehensive experimental measurements and theoretical calculations of SrRuO3's properties, highlighting discrepancies between observed and predicted specific heat and resistivity behavior.

Findings

Resistivity increases nearly linearly up to 1000K despite short mean free path.

Measured specific heat coefficient exceeds theoretical predictions by 3.7 times.

Hall coefficient shows anomalous behavior below Curie temperature.

Abstract

SrRuO$_3$ is a metallic ferromagnet. Its electrical resistivity is reported for temperatures up to 1000K; its Hall coefficient for temperatures up to 300K; its specific heat for temperatures up to 230K. The energy bands have been calculated by self-consistent spin-density functional theory, which finds a ferromagnetic ordered moment of 1.45$\mu_{{\rm B}}$ per Ru atom. The measured linear specific heat coefficient $\gamma$ is 30mJ/mole, which exceeds the theoretical value by a factor of 3.7. A transport mean free path at room temperature of $\approx 10 \AA$ is found. The resistivity increases nearly linearly with temperature to 1000K 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.