Formation of long-range spin distortions by a bound magnetic polaron (original) (raw)

Physical Review B, 2006

Abstract

ABSTRACT The structure of bound magnetic polarons in an antiferromagnetic matrix is studied in the framework of a two-dimensional (2D) and three-dimensional (3D) Kondo-lattice models in the double exchange limit (JH⪢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∕r2 and 1∕r4 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 the usually considered one (saturated core without extended distortions).

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