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Phase separation in Jahn-Teller systems with localized and itinerant electrons
K I Kugel1, A L Rakhmanov, A O Sboychakov
1Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow.
Physical Review Letters
|February 21, 2006
Summary
The Kondo-lattice model explains doped manganite phase diagrams, revealing fewer charge carriers than expected and a strong tendency for phase separation across many doping levels.
Area of Science:
- Condensed matter physics
- Materials science
Background:
- Doped manganites exhibit complex phase diagrams influenced by electron interactions.
- Understanding the interplay between localized and itinerant electrons is crucial for predicting material properties.
Purpose of the Study:
- To analyze the phase diagram of doped manganites using the Kondo-lattice model.
- To investigate the relationship between doping level and the actual number of charge carriers.
- To explore the competition between homogeneous and phase-separated states in these materials.
Main Methods:
- Analysis based on the Kondo-lattice model.
- Consideration of localized electrons due to lattice distortions and band electrons.
- Examination of the phase diagram under varying doping conditions.
Main Results:
- The number of itinerant charge carriers is often lower than the doping level suggests.
- A significant tendency towards phase separation was observed over a broad doping range.
- The model accounts for the interplay between localized and band electron states.
Conclusions:
- The Kondo-lattice model provides a framework for understanding doped manganite phase diagrams.
- Lattice distortions and electron localization significantly impact charge carrier concentration.
- Phase separation is a dominant characteristic in a wide range of doped manganite compositions.