| Автор | Bang-Gui Liu |
| Дата выпуска | 1992-10-26 |
| dc.description | Based on the Hartree-Fock approximation the author proposes a nonlinear spin-wave theory of anisotropic 3D (or quasi-2D) quantum Heisenberg antiferromagnets, which reduces to the known spin-wave theories of isotropy when the anisotropy parameter delta takes special values. In the Hartree-Fock approximation the Dyson-transformed Hamiltonian is equivalent to the Holstein-Primakoff-transformed Hamiltonian truncated up to quartic operator terms. The spin-wave lifetime is obtained in the first-order approximation. For very small delta , the Neel temperature T<sub>N</sub> is much smaller than the coupling constant J, in contrast with T<sub>N</sub> approximately J in the 3D isotropic case, so that the nonlinear anisotropic spin-wave theory is suitable for a description of the ordering phase as well as the paramagnetic phase (up to J) of layer-like antiferromagnets. Applied to the antiferromagnetism of the cuprate La<sub>2</sub>CuO<sub>4</sub> the quasi-2D nonlinear spin-wave theory describes quite satisfactorily the existing experimental data of the Neel transition temperature, the correlation length above the Neel temperature, and staggered magnetization of the material if J=1034 K and the anisotropy parameter is set to be 4*10<sup>-5</sup>. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | A nonlinear spin-wave theory of quasi-2D quantum Heisenberg antiferromagnets |
| Тип | paper |
| DOI | 10.1088/0953-8984/4/43/009 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 4 |
| Первая страница | 8339 |
| Последняя страница | 8356 |
| Аффилиация | Bang-Gui Liu; Inst. of Phys., Chinese Acad. of Sci., Beijing, China |
| Выпуск | 43 |
