Abstract
We present an analysis of superexchange and double exchange interactions in colossal magnetoresistance manganites. The superexchange explains the A-type antiferromagnetic and orbital ordering observed in LaMnO3, and the doping dependence of the anisotropic exchange constants J (a,b) and J c in the polaronic phase for doping by x ≤ 0.1 holes. In the ferromagnetic metallic phase (x; > 0.15 holes) we analyze various possible orbital states, and demonstrate that the ordered orbital states are unstable against the orbital liquid of disordered complex orbitals. The double exchange in the latter state reproduces the observed cubically symmetric magnon dispersion in the ferromagnetic manganites.
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Oleś, A.M., Feiner, L.F. (2001). Magnetic and Orbital Ordering in Manganites. In: Bonča, J., Prelovšek, P., Ramšak, A., Sarkar, S. (eds) Open Problems in Strongly Correlated Electron Systems. NATO Science Series, vol 15. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0771-9_23
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DOI: https://doi.org/10.1007/978-94-010-0771-9_23
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