Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed Using Neutron Inelastic Scattering
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 dispers...
| Main Authors: | , , , , , |
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| Format: | Journal article |
| Language: | English |
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2010
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| _version_ | 1797098450460868608 |
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| author | Ewings, R Freeman, P Enderle, M Kulda, J Prabhakaran, D Boothroyd, A |
| author_facet | Ewings, R Freeman, P Enderle, M Kulda, J Prabhakaran, D Boothroyd, A |
| author_sort | Ewings, R |
| collection | OXFORD |
| description | 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\,\AA$^{2}$. 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. |
| first_indexed | 2024-03-07T05:09:44Z |
| format | Journal article |
| id | oxford-uuid:db280d41-b789-4f5a-9a49-519b89cfbfff |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T05:09:44Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:db280d41-b789-4f5a-9a49-519b89cfbfff2022-03-27T09:08:22ZFerromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed Using Neutron Inelastic ScatteringJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:db280d41-b789-4f5a-9a49-519b89cfbfffEnglishSymplectic Elements at Oxford2010Ewings, RFreeman, PEnderle, MKulda, JPrabhakaran, DBoothroyd, APolarized 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\,\AA$^{2}$. 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. |
| spellingShingle | Ewings, R Freeman, P Enderle, M Kulda, J Prabhakaran, D Boothroyd, A Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed Using Neutron Inelastic Scattering |
| title | Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed
Using Neutron Inelastic Scattering |
| title_full | Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed
Using Neutron Inelastic Scattering |
| title_fullStr | Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed
Using Neutron Inelastic Scattering |
| title_full_unstemmed | Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed
Using Neutron Inelastic Scattering |
| title_short | Ferromagnetic Excitations in La$_{0.82}$Sr$_{0.18}$CoO$_{3}$ Observed
Using Neutron Inelastic Scattering |
| title_sort | ferromagnetic excitations in la 0 82 sr 0 18 coo 3 observed using neutron inelastic scattering |
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