Journal
PHYSICAL REVIEW B
Volume 78, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.155113
Keywords
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Funding
- European project CoMePhS [NNP4-CT-2005-517039]
- International Science and Technology Center [G1335]
- Russian Foundation for Basic Research [07-02-91567, 08-02-00212]
- Deutsche Forschungsgemeinshaft [SFB 608]
- German-Russian project [436 RUS 113/942/0]
- Russian Science Support Foundation
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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 orbitals favoring the electron localization at 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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