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- W2016641888 abstract "It is shown that the layered antiferromagnetic order in stoechiometric LaMnO_3 cannot be understood purely from electronic interactions. On the contrary, it mainly results from strong cooperative Jahn-Teller deformations. Those involve a compression of the Mn-O octahedron along the c-axis (mode Q_3 < 0), while alternate Jahn-Teller deformations occur in the ab-plane (mode Q_2). These deformations stabilize a certain type of orbital ordering. The resulting superexchange couplings are calculated by exact diagonalization, taking into account both e_g and t_{2g} orbitals. The main result is that antiferromagnetic (ferromagnetic) coupling along the c-direction (ab-planes) can be understood only if the Jahn-Teller energy is much larger than the superexchange couplings, which is consistent with experiments. This mechanism contrasts with that based on weak Jahn-Teller coupling which instead predicts elongation along the c-axis (Q_3 > 0). The crucial role of the deformation anisotropy Q_2/Q_3 is also emphasized." @default.
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- W2016641888 date "2000-08-01" @default.
- W2016641888 modified "2023-10-18" @default.
- W2016641888 title "Stabilization of A-type layered antiferromagnetic phase in LaMnO by cooperative Jahn-Teller deformations" @default.
- W2016641888 doi "https://doi.org/10.1007/s100510070164" @default.
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