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28 March 2024
 
  » arxiv » cond-mat/0603711

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Jahn-Teller distortions and phase separation in doped manganites
A.O. Sboychakov ; K.I. Kugel ; A.L. Rakhmanov ;
Date 27 Mar 2006
Subject Strongly Correlated Electrons
AbstractA "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, AF-PM, 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 metal-insulator transition induced by changing temperature or the magnetic field can take place at some characteristic values of the doping level corresponding to the crossover between different kinds of the phase separation.
Source arXiv, cond-mat/0603711
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