Manganites at Quarter Filling: Role of Jahn-Teller Interactions

Abstract

We have analyzed different correlation functions in a realistic spin-orbital model for half-doped manganites. Using a finite-temperature diagonalization technique the CE phase was found in the charge-ordered phase in the case of small antiferromagnetic interactions between $t_{2g}$ electrons. It is shown that a key ingredient responsible for stabilization of the CE-type spin and orbital-ordered state is the cooperative Jahn-Teller (JT) interaction between next-nearest Mn${}^{+3}$ neighbors mediated by the breathing mode distortion of Mn${}^{+4}$ octahedra and displacements of Mn${}^{+4}$ ions. The topological phase factor in the Mn-Mn hopping leading to gap formation in one-dimensional models for the CE phase as well as the nearest neighbor JT coupling are not able to produce the zigzag chains typical for the CE phase in our model.

arXiv comment16 pages with 16 figures, contains a more detailed parameter estimate based on the structural data by Radaelli et al. (accepted for publication in Phys. Rev. B)

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Cited by in corpus (8)

• Orbital polarons versus itinerant e_g electrons in doped manganites
• Doping dependence of spin and orbital correlations in layered manganites
• Jahn-Teller distortions and phase separation in doped manganites
• THz Field Control of In-Plane Orbital Order in La0.5Sr1.5MnO4
• In-plane anisotropy of the electronic structure for the charge/orbital-ordered state in half-doped manganite with layered structure
• Charge and orbital order in transition metal oxides
• Spin-orbital physics in the optical conductivity of quarter-filled manganites
• Jahn-Teller distortions and the magnetic order in the perovskite manganites