Doped orbitally-ordered systems: another case of phase separation

Details Doped orbitally-ordered systems: another case of phase separation Doped orbitally-ordered systems: another case of phase separation

2008-05-30

arxiv.org/abs/0805.4806v1

Phys. Rev. B 78, 155113 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 4 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.78.155113

A possible mechanism of electronic phase separation in the systems with orbital ordering is analyzed. We suggest a simple model taking into account an interplay between the delocalization of charge carriers introduced by doping and the cooperative ordering of local lattice distortions. The proposed mechanism is quite similar to the double exchange usually invoked for interpretation of phase separation in doped magnetic oxides like manganites, but can be efficient even in the absence of any magnetic ordering. It is demonstrated that the delocalized charge carriers favor the formation of nanoscale inhomogeneities with the orbital structure different from that in the undoped material. The directional character of orbitals leads to inhomogeneities of different shapes and sizes.

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