| Автор | D J J Farnell |
| Автор | S E Krüger |
| Автор | J B Parkinson |
| Дата выпуска | 1997-09-08 |
| dc.description | We study quantum spin systems in the 1D, 2D square and 3D cubic lattices with nearest-neighbour XY-exchange. We use the coupled-cluster method (CCM) to calculate the ground-state energy, the T = 0 sublattice magnetization and the excited-state energies, all as functions of the anisotropy parameter . We consider the case with S = 1/2 in detail and give some results for higher S. In 1D these results are compared with the exact S = 1/2 results and in 2D with Monte Carlo and series expansions. We obtain critical points close to the expected value and our extrapolated LSUBn results for the ground-state energy are well converged for all except very close to the critical point. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Coupled-cluster treatment of the XY-model |
| Тип | paper |
| DOI | 10.1088/0953-8984/9/36/008 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 9 |
| Первая страница | 7601 |
| Последняя страница | 7608 |
| Аффилиация | D J J Farnell; Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK |
| Аффилиация | S E Krüger; Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK |
| Аффилиация | J B Parkinson; Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK |
| Выпуск | 36 |
