Spin dynamics and exchange interactions in CuO measured by neutron scattering
The magnetic properties of CuO encompass several contemporary themes in condensed matter physics, including quantum magnetism, magnetic frustration, magnetically-induced ferroelectricity and orbital currents. Here we report polarized and unpolarized neutron inelastic scattering measurements which pr...
| Հիմնական հեղինակներ: | , , , , , , , , , |
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| Ձևաչափ: | Journal article |
| Հրապարակվել է: |
American Physical Society
2018
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| _version_ | 1826290885533368320 |
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| author | Jacobsen, H Gaw, S Princep, A Hamilton, E Tóth, S Ewings, R Enderle, M Hétroy Wheeler, E Prabhakaran, D Boothroyd, A |
| author_facet | Jacobsen, H Gaw, S Princep, A Hamilton, E Tóth, S Ewings, R Enderle, M Hétroy Wheeler, E Prabhakaran, D Boothroyd, A |
| author_sort | Jacobsen, H |
| collection | OXFORD |
| description | The magnetic properties of CuO encompass several contemporary themes in condensed matter physics, including quantum magnetism, magnetic frustration, magnetically-induced ferroelectricity and orbital currents. Here we report polarized and unpolarized neutron inelastic scattering measurements which provide a comprehensive map of the cooperative spin dynamics in the low temperature antiferromagnetic (AFM) phase of CuO throughout much of the Brillouin zone. At high energies $(E \gtrsim 100\,meV)$ the spectrum displays continuum features consistent with the des Cloizeax--Pearson dispersion for an ideal $S=\frac{1}{2}$ Heisenberg AFM chain. At lower energies the spectrum becomes more three-dimensional, and we find that a linear spin-wave model for a Heisenberg AFM provides a very good description of the data, allowing for an accurate determination of the relevant exchange constants in an effective spin Hamiltonian for CuO. In the high temperature helicoidal phase, there are features in the measured low-energy spectrum that we could not reproduce with a spin-only model. We discuss how these might be associated with the magnetically-induced multiferroic behavior observed in this phase. |
| first_indexed | 2024-03-07T02:51:03Z |
| format | Journal article |
| id | oxford-uuid:adaf6f73-6a92-4a87-84f2-6c87592a427e |
| institution | University of Oxford |
| last_indexed | 2024-03-07T02:51:03Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:adaf6f73-6a92-4a87-84f2-6c87592a427e2022-03-27T03:37:27ZSpin dynamics and exchange interactions in CuO measured by neutron scatteringJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:adaf6f73-6a92-4a87-84f2-6c87592a427eSymplectic Elements at OxfordAmerican Physical Society2018Jacobsen, HGaw, SPrincep, AHamilton, ETóth, SEwings, REnderle, MHétroy Wheeler, EPrabhakaran, DBoothroyd, AThe magnetic properties of CuO encompass several contemporary themes in condensed matter physics, including quantum magnetism, magnetic frustration, magnetically-induced ferroelectricity and orbital currents. Here we report polarized and unpolarized neutron inelastic scattering measurements which provide a comprehensive map of the cooperative spin dynamics in the low temperature antiferromagnetic (AFM) phase of CuO throughout much of the Brillouin zone. At high energies $(E \gtrsim 100\,meV)$ the spectrum displays continuum features consistent with the des Cloizeax--Pearson dispersion for an ideal $S=\frac{1}{2}$ Heisenberg AFM chain. At lower energies the spectrum becomes more three-dimensional, and we find that a linear spin-wave model for a Heisenberg AFM provides a very good description of the data, allowing for an accurate determination of the relevant exchange constants in an effective spin Hamiltonian for CuO. In the high temperature helicoidal phase, there are features in the measured low-energy spectrum that we could not reproduce with a spin-only model. We discuss how these might be associated with the magnetically-induced multiferroic behavior observed in this phase. |
| spellingShingle | Jacobsen, H Gaw, S Princep, A Hamilton, E Tóth, S Ewings, R Enderle, M Hétroy Wheeler, E Prabhakaran, D Boothroyd, A Spin dynamics and exchange interactions in CuO measured by neutron scattering |
| title | Spin dynamics and exchange interactions in CuO measured by neutron scattering |
| title_full | Spin dynamics and exchange interactions in CuO measured by neutron scattering |
| title_fullStr | Spin dynamics and exchange interactions in CuO measured by neutron scattering |
| title_full_unstemmed | Spin dynamics and exchange interactions in CuO measured by neutron scattering |
| title_short | Spin dynamics and exchange interactions in CuO measured by neutron scattering |
| title_sort | spin dynamics and exchange interactions in cuo measured by neutron scattering |
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