Complex orbital state in manganites

Abstract

The $e_g$-orbital states with complex coefficients of the linear combination of $x^2-y^2$ and $3z^2-r^2$ are studied for the ferromagnetic state in doped manganites. Especially the focus is put on the competition among uniform complex, staggered complex, and real orbital states. As the hole-doping $x$ increases, the real, the canted complex, and the staggered complex orbital states appears successively. Uniform complex state analoguous to Nagaoka ferromagnet does not appear. These complex states can be expressed as a resonating state among the planer orbitals as the orbital liquid, accompanied by no Jahn-Teller distortion.

14 pages, 6 figures

References in corpus (7)

• Transition between two ferromagnetic states driven by orbital ordering in La_{0.88}Sr_{0.12}MnO_3
• Phase Separation Induced by Orbital Degrees of Freedom in Models for Manganites with Jahn-Teller Phonons
• Double-exchange via degenerate orbitals
• Orbital Polarons in the Metal-Insulator Transition of Manganites
• Theory of anomalous magnon softening in ferromagnetic manganites
• Optical conductivity of colossal magnetorestistance compounds: Role of orbital degeneracy in the ferromagnetic phase
• Orbital Degree of Freedom and Phase Separation in Ferromagnetic Manganites at Finite Temperatures

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• Oxygen deficiency induced suppression of JT-distortion and stabilization of chargeordering in La0.2Sr0.8MnO3-d
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• Spin-orbital gap of multiorbital antiferromagnet