Anomalous spin susceptibility and magnetic polaron formation in the double exchange systems

Abstract

The magnetic susceptibility and spin-spin correlation of the double-exchange model for doped manganites are investigated through the Monte Carlo calculations on the three-dimensional lattice model. Deviations of the susceptibility from the Curie-Weiss behavior above the ferromagnetic ordering temperature $T_c$ seem to indicate a formation of local ferromagnetic clusters in the vicinity of $T_c$, which is consistent with recent electron paramagnetic resonance experiments for La${}_{2/3}$Ca${}_{1/3}$MnO${}_3$. A further analysis of the spin-spin correlations show the ferromagnetic cluster size to be three-to-four lattice spacings, suggesting that the charge carriers may form magnetic polarons.

5 pages, 5 figures, Latex

References in corpus (7)

• Phase Separation in Electronic Models for Manganites
• Coexistence of localized and itinerant carriers near Tc in calcium-doped manganites
• Optical conductivity of colossal magnetorestistance compounds: Role of orbital degeneracy in the ferromagnetic phase
• Anomalous ferromagnetic spin fluctuations in an antiferromagnetic insulator Pr_{1-x}Ca_{x}MnO_{3}
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• Specific Heat of defects in the Haldane System Y_2BaNiO_5
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Cited by in corpus (9)

• Critical Temperature of Ferromagnetic Transition in Three-Dimensional Double-Exchange Models
• Monte Carlo Study of Doping Change and Disorder Effect on Double Exchange Ferromagnetism
• Uniform hopping approach to the FM Kondo Model at finite temperature
• Magnetic Polarons in the 1D FM Kondo Model
• Visualizing high-temperature spin dynamics in La1-xCaxMnO3 from a mapping of EPR linewidth and g factor
• Spin and lattice effects in the Kondo lattice model
• Dynamics of Phase Separated States in the Double Exchange Model
• Polaronic Aspects of the two-dimensional Ferromagnetic Kondo Model
• Transverse spin relaxation and magnetic correlation in $P{r}_{1-x}C{a}_{x}Mn{O}_3$ : influence of particle size variation and chemical doping