Journal
PHYSICAL REVIEW B
Volume 80, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.024423
Keywords
cobalt; doping; iron; magnetic transitions; phase separation
Funding
- European project CoMe-PhS, International Science and Technology Center [G1335]
- Russian Foundation for Basic Research [07-02-91567, 08-02-00212]
- Deutsche Forschungsgemeinshaft [SFB 608]
- German-Russian [436 RUS 113/942/0]
- Russian Science Support Foundation
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Spin-state transitions, observed in many transition-metal compounds containing Co3+ and Fe2+, may occur with the change in temperature and pressure but also with doping, in which case the competition of single-site effects and kinetic energy of doped carriers can favor a change in the spin state. We consider this situation in a simple model, formally resembling that used for manganites in Kugel, Rakhmanov, and Sboychakov, Phys. Rev. Lett. 95, 267210 (2005). Based on such a model, we predict the possibility of a jumplike change in the number of Co3+ ions undergoing spin-state transition caused by hole doping. A tendency to the electronic phase separation within a wide doping range is demonstrated. Phase diagrams with the regions of phase separation are constructed at different values of the characteristic parameters of the model.
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