Jahn-Teller distortions and phase separation in doped manganites

Details Jahn-Teller distortions and phase separation in doped manganites Jahn-Teller distortions and phase separation in doped manganites

2006-03-27

arxiv.org/abs/cond-mat/0603711v3

Phys. Rev. B 74, 014401 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

14 pages, 7 figures, submitted to Phys. Rev. B.; v.2 contains the changes introduced according to comments of the PRB Referees

Scientific paper

10.1103/PhysRevB.74.014401

A "minimal model" of the Kondo-lattice type is used to describe a competition between the localization and metallicity in doped manganites and related magnetic oxides with Jahn-Teller ions. It is shown that the number of itinerant charge carriers can be significantly lower than that implied by the doping level x. A strong tendency to the phase separation is demonstrated for a wide range of intermediate doping concentrations vanishing at low and high doping. The phase diagram of the model in the x-T plane is constructed. At low temperatures, the system is in a state with a long-range magnetic order: antiferromagnetic (AF), ferromagnetic (FM), or AF-FM phase separated (PS) state. At high temperatures, there can exist two types of the paramagnetic (PM) state with zero and nonzero density of the itinerant electrons. In the intermediate temperature range, the phase diagram includes different kinds of the PS states: AF-FM, FM-PM, and PM with different content of itinerant electrons. The applied magnetic field changes the phase diagram favoring the FM ordering. It is shown that the variation of temperature or magnetic field can induce the metal-insulator transition in a certain range of doping levels.

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