Joint superexchange--Jahn-Teller mechanism for A-type antiferromagnetism in LaMnO3
Abstract
We propose a mechanism for A-type antiferromagnetism in orthorombic LaMnO3, 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 Q2 is large enough, a condition generally fulfilled in existing data.
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