Onset of metallic ferromagnetism in a doped spin-orbital chain

Abstract

Starting from a spin-orbital model for doped manganites, we investigate a competition between ferromagnetic and antiferromagnetic order in a one-dimensional model at finite temperature. The magnetic and orbital order at half filling support each other and depend on a small antiferromagnetic superexchange between t_{2g} spins and on an alternating Jahn-Teller potential. The crossover to a metallic ferromagnetic phase found at finite doping is partly suppressed by the Jahn-Teller potential which may localize e_g electrons.

6 pages, 4 figures, contribution to ICTP Ustron, 2004, see phys. stat. sol. at http://www.interscience.wiley.com

References in corpus (5)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Microscopic modelling of doped manganites
• Island phases and charge order in two-dimensional manganites
• Uniform hopping approach to the FM Kondo Model at finite temperature
• Effective spinless fermions in the strong coupling Kondo model

Cited by in corpus (6)

• Absence of Hole Confinement in Transition Metal Oxides with Orbital Degeneracy
• Frustration and entanglement in the $t_{2g}$ spin--orbital model on a triangular lattice: valence--bond and generalized liquid states
• Orbital liquid in ferromagnetic manganites: The orbital Hubbard model for $e_g$ electrons
• Spectral properties of orbital polarons in Mott insulators
• Doping dependence of spin and orbital correlations in layered manganites
• Magnetic and orbital correlations in a two-site molecule