Abstract
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 model in the double exchange limit. A conduction electron appearing as a result of doping becomes bound by a non-magnetic donor impurity and forms a ferromagnetic core of the size about the electron localization length (bound magnetic polaron). We found 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). For doped anisotropic antiferromagnets, it was shown that the most favorable shape of a magnetic polaron corresponds to an ellipse in the 2D case and to an ellipsoid in the 3D case.
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