Magnetic Transition Temperature of (La,Sr)MnO$_3$

TL;DR

This paper theoretically investigates the magnetic transition temperatures of (La,Sr)MnO$_3$ using the Kondo lattice model, accurately reproducing experimental Curie and Neel temperatures and analyzing pressure effects.

Contribution

It provides a quantitative theoretical analysis of magnetic phase transitions in (La,Sr)MnO$_3$ using an exact solution of the Kondo lattice model on the Bethe lattice.

Findings

Accurately reproduces Curie temperatures in the double-exchange ferromagnetic region.

Reproduces Neel temperature at x=0.

Discusses pressure effects on Curie temperature.

Abstract

Using the Kondo lattice model with classical spins in infinite dimension, magnetic phase transition in the perovskite-type $3d$ transition-metal oxide (La,Sr)MnO$_3$ is theoretically studied. On the Bethe lattice, the self-consistency equations are solved exactly. Curie temperatures at the region of double-exchange ferromagnetism $0.1 < x < 0.25$ as well as the Neel temperature at $x=0$ are well reproduced quantitatively. Pressure effect on the Curie temperature is also discussed.