Abstract
The current investigation is devoted to the theoretical study of orbital structure influence upon magnetic subsystem in half-doped charge-ordered manganites. The main interaction of magnetic subsystem is superexchange interaction. It forms spin-wave dispersion dependencies. Because of charge and orbital ordering, there are a lot of superexchange parameters in these compounds. That makes the dispersion rather complicated. This work clarifies some features of dispersion in terms of orbitally-dependent superexchange interactions.
Highlights
The manganite crystals R1–xAxMnO3 are known as colossal magnetoresistance (CMR) compounds
The current investigation is devoted to the theoretical study of orbital structure influence upon magnetic subsystem in half-doped charge-ordered manganites
These crystals have a lot of properties forming peculiar magnetic structures, such as low-dimensional, frustrated or incommensurate orderings [1]
Summary
The manganite crystals R1–xAxMnO3 (where R3+ is a rare earth ion, A2+ is an alkaline earth ion, and x is a doping rate) are known as colossal magnetoresistance (CMR) compounds. These crystals have a lot of properties forming peculiar magnetic structures, such as low-dimensional, frustrated or incommensurate orderings [1]. The focus of this paper is on half-doped charge-ordered (CO) manganites with 3D perovskite structure R0.5A0.5MnO3, layered perovskite R0.5A1.5MnO4 and bilayer perovskite RA2Mn2O7. The estimation of magnetic interactions dependent upon an orbital ordering was made mainly using Neel temperatures [7, 8]. Recent experimental studies of spin-waves dispersion dependencies allow estimating exchange parameters between different manganese pairs [9,10,11] more precisely
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