2 research outputs found
High-Pressure Phase Diagram in the Manganites: a Two-site Model Study
The pressure dependence of the Curie temperature in manganites,
recently studied over a wide pressure range, is not quantitatively accounted
for by the quenching of Jahn-Teller distortions, and suggests the occurrence of
a new pressure-activated localizing processes. We present a theoretical
calculation of based on a two-site double-exchange model with
electron-phonon coupling interaction and direct superexchange between the core spins. We calculate the pressure dependence of and compare
it with the experimental phase diagram. Our results describe the experimental
behavior quite well if a pressure-activated enhancement of the
antiferromagnetic superexchange interaction is assumed