Mean-Field Approach to Charge, Orbital, and Spin Ordering in Manganites

Abstract

We present a mean-field theory of charge, orbital, and spin ordering in manganites at 50% and 0% dopings by considering Jahn-Teller interaction, nearest-neighbor repulsion, and no single-site double occupancy. For spinless fermions, we show that Jahn-Teller distortion and charge-orbital ordering occur simultaneously. In our two-dimensional model at 50% doping, for small nearest-neighbor repulsion the system is orbitally polarized while for larger repulsion the system undergoes CE type ordering. As for the 0% doping case, the ground state is orbitally antiferromagnetic. Upon including spin degree of freedom, at both 50% and 0% dopings the ordering remains the same at small antiferromagnetic coupling between adjacent core spins.

4 pages, 3 figures

References in corpus (4)

• Charge and orbital order in half-doped manganites
• Interplay between charge, orbital and magnetic order in Pr_{1-x}Ca_xMnO_3
• Ferromagnetic, A-type, and Charge-Ordered CE-type States in Doped Manganites using Jahn-Teller Phonons
• Colossal Magnetoresistance using the Small Polaron Picture with Finite Bandwidth Effects

Cited by in corpus (2)

• Effective spinless fermions in the strong coupling Kondo model
• Aspects of the FM Kondo Model: From Unbiased MC Simulations to Back-of-an-Envelope Explanations