Origin of the Orbital Ordering in LaMnO$_3$
Olga Sikora, Andrzej M. Oles
TL;DR
This paper investigates the origin of orbital ordering in LaMnO3 by analyzing the structural phase transition and its relation to Jahn-Teller coupling, superexchange interactions, and Coulomb effects.
Contribution
It provides a quantitative determination of the Jahn-Teller coupling constant and explores how exchange interactions depend on Coulomb U and orbital order.
Findings
Jahn-Teller coupling constant determined from structural transition temperature
Exchange constants depend on Coulomb U and orbital ordering
Insights into the interplay between lattice distortions and magnetic interactions
Abstract
We use the temperature of the structural phase transition to determine the Jahn-Teller (JT) coupling constant in the model derived for LaMnO which includes both the superexchange between S=2 spins and the JT effect. We also investigate the dependence of the exchange constants on the value of the on-site Coulomb element , and on the orbital ordering.
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Taxonomy
TopicsMagnetic and transport properties of perovskites and related materials · Rare-earth and actinide compounds · High-pressure geophysics and materials