Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-29
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 5 figures, submitted to Phys. Rev. B; v.2 contains the changes introduced according to comments of the PRB Referees
Scientific paper
The structure of bound magnetic polarons in an antiferromagnetic matrix is studied in the framework of two-dimensional (2D) and three-dimensional (3D) Kondo-lattice models in the double exchange limit (J_H >> t). The conduction electron is bound by a nonmagnetic donor impurity and forms a ferromagnetic core of the size about the electron localization length (bound magnetic polaron). We find that the magnetic polaron produces rather long-range extended spin distortions of the antiferromagnetic background around the core. In a wide range of distances, these distortions decay as 1/r^2 and 1/r^4 in 2D and 3D cases, respectively. In addition, the magnetization of the core is smaller than its saturation value. Such a magnetic polaron state is favorable in energy in comparison to usually considered one (saturated core without extended distortions).
Kagan Maxim Yu.
Kugel' K. I.
Ogarkov S. L.
Rakhmanov A. L.
Sboychakov A. O.
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