Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed Using Neutron Inelastic Scattering

R. A. Ewings; P. G. Freeman; M. Enderle; J. Kulda; D. Prabhakaran; A. T. Boothroyd

doi:10.1103/PhysRevB.82.144401

paper

Ferromagnetic Excitations in La $_{0.82}$ Sr $_{0.18}$ CoO $_{3}$ Observed Using Neutron Inelastic Scattering

arXiv:1007.1919 · doi:10.1103/PhysRevB.82.144401

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.

7 pages, 6 figures

Ferromagnetic Excitations in La $_{0.82}$ Sr $_{0.18}$ CoO $_{3}$ Observed Using Neutron Inelastic Scattering

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Ferromagnetic Excitations in La0.82​Sr0.18​CoO3​ Observed Using Neutron Inelastic Scattering

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Ferromagnetic Excitations in La $_{0.82}$ Sr $_{0.18}$ CoO $_{3}$ Observed Using Neutron Inelastic Scattering