High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4
<p>Inelastic neutron scattering is used to study the magnetic excitations of the <em>S</em>=1 square-lattice antiferromagnet <span tabindex="0">La<sub>2</sub>NiO<sub>4</sub></span>. We find that the spin waves cannot be describ...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2023
|
| _version_ | 1797111533954662400 |
|---|---|
| author | Petsch, AN Headings, NS Prabhakaran, D Kolesnikov, AI Frost, CD Boothroyd, AT Coldea, R Hayden, SM |
| author_facet | Petsch, AN Headings, NS Prabhakaran, D Kolesnikov, AI Frost, CD Boothroyd, AT Coldea, R Hayden, SM |
| author_sort | Petsch, AN |
| collection | OXFORD |
| description | <p>Inelastic neutron scattering is used to study the magnetic excitations of the <em>S</em>=1 square-lattice antiferromagnet <span tabindex="0">La<sub>2</sub>NiO<sub>4</sub></span>. We find that the spin waves cannot be described by a simple classical (harmonic) Heisenberg model with only nearest-neighbor interactions. The spin-wave dispersion measured along the antiferromagnetic Brillouin-zone boundary shows a minimum energy at the (1/2,0) position as is observed in some <em>S</em><span tabindex="0">=1/2</span> square-lattice antiferromagnets. Thus, our results suggest that the quantum dispersion renormalization effects or longer-range exchange interactions observed in cuprates and other <em>S</em> =1/2 square-lattice antiferromagnets are also present in La<sub>2</sub>NiO<sub>4</sub>. We also find that the overall intensity of the spin-wave excitations is suppressed relative to linear spin-wave theory, indicating that covalency is important. Two-magnon scattering is also observed.</p> |
| first_indexed | 2024-03-07T08:10:11Z |
| format | Journal article |
| id | oxford-uuid:cfa0c23c-22ca-4991-9ad6-0c1a3a592a8c |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T08:10:11Z |
| publishDate | 2023 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:cfa0c23c-22ca-4991-9ad6-0c1a3a592a8c2023-11-22T12:39:59ZHigh-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:cfa0c23c-22ca-4991-9ad6-0c1a3a592a8cEnglishSymplectic ElementsAmerican Physical Society2023Petsch, ANHeadings, NSPrabhakaran, DKolesnikov, AIFrost, CDBoothroyd, ATColdea, RHayden, SM<p>Inelastic neutron scattering is used to study the magnetic excitations of the <em>S</em>=1 square-lattice antiferromagnet <span tabindex="0">La<sub>2</sub>NiO<sub>4</sub></span>. We find that the spin waves cannot be described by a simple classical (harmonic) Heisenberg model with only nearest-neighbor interactions. The spin-wave dispersion measured along the antiferromagnetic Brillouin-zone boundary shows a minimum energy at the (1/2,0) position as is observed in some <em>S</em><span tabindex="0">=1/2</span> square-lattice antiferromagnets. Thus, our results suggest that the quantum dispersion renormalization effects or longer-range exchange interactions observed in cuprates and other <em>S</em> =1/2 square-lattice antiferromagnets are also present in La<sub>2</sub>NiO<sub>4</sub>. We also find that the overall intensity of the spin-wave excitations is suppressed relative to linear spin-wave theory, indicating that covalency is important. Two-magnon scattering is also observed.</p> |
| spellingShingle | Petsch, AN Headings, NS Prabhakaran, D Kolesnikov, AI Frost, CD Boothroyd, AT Coldea, R Hayden, SM High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4 |
| title | High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4 |
| title_full | High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4 |
| title_fullStr | High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4 |
| title_full_unstemmed | High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4 |
| title_short | High-energy spin waves in the spin-1 square-lattice antiferromagnet La2NiO4 |
| title_sort | high energy spin waves in the spin 1 square lattice antiferromagnet la2nio4 |
| work_keys_str_mv | AT petschan highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT headingsns highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT prabhakarand highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT kolesnikovai highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT frostcd highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT boothroydat highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT coldear highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 AT haydensm highenergyspinwavesinthespin1squarelatticeantiferromagnetla2nio4 |