Spin-charge and spin-orbital coupling effects on spin dynamics in ferromagnetic manganites

TL;DR

This paper investigates how spin-charge and spin-orbital couplings influence spin dynamics in ferromagnetic manganites, providing quantitative comparisons with experiments and highlighting the effects of orbital phenomena across doping levels.

Contribution

It offers a detailed theoretical analysis of the impact of orbital effects on spin dynamics in manganites, with realistic parameters and experimental validation.

Findings

Quantitative agreement with experimental spin stiffness and magnon dispersion.

Identification of orbital effects on magnon softening and damping.

Insights into the role of orbital correlations across doping regimes.

Abstract

Correlation-induced spin-charge and spin-orbital coupling effects on spin dynamics in ferromagnetic manganites are calculated with realistic parameters in order to provide a quantitative comparison with experimental results for spin stiffness, magnon dispersion, magnon damping, anomalous zone-boundary magnon softening, and Curie temperature. The role of orbital degeneracy, orbital ordering, and orbital correlations on spin dynamics in different doping regimes is highlighted.