Dimensional crossover and the magnetic transition in electron doped manganites

Details Dimensional crossover and the magnetic transition in electron doped manganites Dimensional crossover and the magnetic transition in electron doped manganites

2011-12-08

arxiv.org/abs/1112.1785v1

Phys. Rev. B 84, 214414 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.84.214414

We introduce a microscopic model for electron doped manganites that explains the mechanism of the observed transition from $G$-type antiferromagnetic ($G$-AF) to $C$-type antiferromagnetic ($C$-AF) order under increasing doping by double exchange mechanism. The model unravels the crucial role played by $e_g$ orbital degrees of freedom and explains the observed metal-to-insulator transition by a dimensional crossover at the magnetic phase transition. The specific heat and the spin canting angle found for the $G$-AF phase agree with the experimental findings. As a surprising outcome of the theory we find that spin canting is suppressed in the $C$-AF phase, in agreement with the experiment, due to the Fermi surface topology.

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