| Автор | Oliver Fritz |
| Автор | Stephen W Lovesey |
| Автор | Greg I Watson |
| Дата выпуска | 1998-07-20 |
| dc.description | Various static spin-correlation functions and the weights of the spin excitations, or collective normal modes, in the van Hove response function, observed in neutron scattering experiments, are calculated as a function of temperature for a model quantum-spin chain. The spins interact through an isotropic Heisenberg exchange that extends to nearest-neighbour spins. In our model, spins of magnitude 1/2 form a dimerized chain with alternating exchange interactions. We explore the static and dynamic properties for ferromagnetic and antiferromagnetic exchange interactions. Results for the various properties are shown to be exact in the limit of a high temperature, and we argue that the results are very good at low temperatures. Unlike the case for linear spin-wave theory, the results are also exact in the limit of strong dimerization, i.e. non-interacting coupled pairs of spins. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Static and dynamic properties of a dimerized quantum-spin chain |
| Тип | paper |
| DOI | 10.1088/0953-8984/10/28/013 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 10 |
| Первая страница | 6321 |
| Последняя страница | 6332 |
| Аффилиация | Oliver Fritz; ISIS Facility, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK |
| Аффилиация | Stephen W Lovesey; ISIS Facility, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK |
| Аффилиация | Greg I Watson; ISIS Facility, Rutherford Appleton Laboratory, Oxfordshire OX11 0QX, UK |
| Выпуск | 28 |
