Onset of metallic ferromagnetism in a doped spin-orbital chain

Details Onset of metallic ferromagnetism in a doped spin-orbital chain Onset of metallic ferromagnetism in a doped spin-orbital chain

2005-01-12

arxiv.org/abs/cond-mat/0501290v1

phys. stat. sol. 242, 311 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1002/pssb.200460050

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.

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