Joint superexchange--Jahn-Teller mechanism for A-type antiferromagnetism in $LaMnO_3$
D. Feinberg (2), P. Germain (1), M. Grilli (1,2), and G. Seibold (1), ((1) Istituto di Fisica della Materia e Dipartimento di Fisica, Universita', di Roma ``La Sapienza'', (2) Laboratoire des Proprietes Electroniques des, Solides, CNRS, Grenoble, France)
TL;DR
This paper proposes a new mechanism involving superexchange and Jahn-Teller effects to explain A-type antiferromagnetism in LaMnO_3, aligning with observed structural distortions and orbital ordering.
Contribution
It introduces a joint superexchange--Jahn-Teller mechanism that accounts for magnetic ordering in LaMnO_3 based on structural and orbital data.
Findings
Orbital ordering from Jahn-Teller distortions induces A-type antiferromagnetism.
Large in-plane Jahn-Teller distortion Q_2 is essential for the magnetic order.
The mechanism aligns with experimental structural data.
Abstract
We propose a mechanism for A-type antiferromagnetism in orthorombic LaMnO_3, compatible with the large Jahn-Teller splitting inferred from structural data. Orbital ordering resulting from Jahn-Teller distortions effectively leads to A-type ordering (antiferromagnetic in the c axis and ferromagnetic in the ab plane) provided the in-plane distorsion Q_2 is large enough, a condition generally fulfilled in existing data.
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