Charge and orbital order in half-doped manganites

Details Charge and orbital order in half-doped manganites Charge and orbital order in half-doped manganites

1999-10-16

arxiv.org/abs/cond-mat/9910253v1

Physics

Condensed Matter

Strongly Correlated Electrons

To appear in Phys. Rev. Lett., 4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.83.5118

An explanation is given for the charge order, orbital order and insulating state observed in half-doped manganese oxides, such as Nd$_{1/2}$Sr$_{1/2}$MnO$_{3}$. The competition between the kinetic energy of the electrons and the magnetic exchange energy drives the formation of effectively one-dimensional ferromagnetic zig-zag chains. Due to a topological phase factor in the hopping, the chains are intrinsically insulating and orbital-ordered. Most surprisingly, the strong Coulomb interaction between electrons on the same Mn-ion leads to the experimentally observed charge ordering. For doping less than 1/2 the system is unstable towards phase separation into a ferromagnetic metallic and charge-ordered insulating phase.

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