| Автор | S Fulton |
| Автор | S E Nagler |
| Автор | L M N Needham |
| Автор | B M Wanklyn |
| Дата выпуска | 1994-08-15 |
| dc.description | A study of the quasi-two-dimensional antiferromagnet KFeF<sub>4</sub> below the transition temperature, T<sub>N</sub>=13 K, has been undertaken using neutron scattering techniques. The dispersion relation of the spin excitations is well described by a model Hamiltonian incorporating Heisenberg exchange interactions and uniaxial anisotropy. The anisotropy controls the energy of the zone centre mode whose frequency varies in the same way with temperature as the square of the staggered magnetization which is described by the two-dimensional Ising model. Dipole-dipole contributions are too small to account fully for the anisotropy. Different nearest-neighbour exchange energies are found along the a and b directions due to different superexchange paths, with J<sub>1</sub>=-2.18 meV along a, and J<sub>2</sub>=-2.73 meV along b. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Spin waves and temperature-dependent behaviour of the quasi-two-dimensional antiferromagnet KFeF<sub>4</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/6/33/014 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 6 |
| Первая страница | 6667 |
| Последняя страница | 6678 |
| Аффилиация | S Fulton; Clarendon Lab., Oxford Univ., UK |
| Аффилиация | S E Nagler; Clarendon Lab., Oxford Univ., UK |
| Аффилиация | L M N Needham; Clarendon Lab., Oxford Univ., UK |
| Аффилиация | B M Wanklyn; Clarendon Lab., Oxford Univ., UK |
| Выпуск | 33 |
