Ferromagnetic Excitations in La${}_{0.82}$Sr${}_{0.18}$CoO${}_3$ Observed Using Neutron Inelastic Scattering

Abstract

Polarized neutron inelastic scattering has been used to measure spin excitations in ferromagnetic La${}_{0.82}$Sr${}_{0.18}$CoO${}_3$. The magnon spectrum of these spin excitations is well defined at low energies but becomes heavily damped at higher energies, and can be modeled using a quadratic dispersion. We determined a spin wave stiffness constant of $D=94\pm 3$\,meV\,Å${}^2$. Assuming a nearest-neighbor Heisenberg model we find reasonable agreement between the exchange determined from D and the bulk Curie temperature. Several possible mechanisms to account for the observed spin-wave damping are discussed.

arXiv comment7 pages, 6 figures

References in corpus (6)

• Structure, Magnetization and Resistivity of La${}_{1-x}$M${}_x$CoO${}_3$ (M = Ca, Sr, and Ba)
• Nano-magnetic droplets and implications to orbital ordering in La1-xSrxCoO3
• Spin-state polaron in lightly hole-doped LaCoO_3
• Spin Wave Theory of Double Exchange Ferromagnets
• Evolution of spin-wave excitations in ferromagnetic metallic manganites
• Magnons in Ferromagnetic Metallic Manganites

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• Quasi-Nambu-Goldstone modes in many-body scar models
• Temperature evolution of superparamagnetic clusters in single-crystal La0.85Sr0.15CoO3 from nonlinear magnetic ac response and neutron depolarization