Stabilization of magnetic polarons in antiferromagnetic semiconductors by extended spin distortions

Abstract

We study the problem of a magnetic polaron in an antiferromagnetic semiconductor (ferron). We obtain an analytical solution for the distortion produced in the magnetic structure of the d-spins due to the presence of a charge carrier bound to an impurity. The region in which the charge carrier is trapped is of the order of the lattice constant (small ferron) but the distortion of the magnetic structure extends over much larger distance. It is shown that the presence of this distortion makes the ferron more stable, and introduces a new length scale in the problem.

arXiv comment5 pages, 1 figure, RevTex 4, submitted to PRB; v2: one reference added, minor changes in the experiment discussion; v3: minor changes in text

References in corpus (3)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Liquid-like spatial distribution of magnetic polarons revealed by neutron scattering in La{1-x}Ca{x}MnO3
• Approach to the metal-insulator transition in La(1-x)CaxMnO3 (0<x<.2): magnetic inhomogeneity and spin wave anomaly

Cited by in corpus (4)

• Electronic phase separation: recent progress in the old problem
• Small-scale phase separation in doped anisotropic antiferromagnets
• The evolution with temperature of magnetic polaron state in an antiferromagnetic chain with impurities
• Theory of bound magnetic polarons in cubic and uniaxial antiferromagnets