| Автор | S N Evangelou |
| Автор | A Z Wang |
| Дата выпуска | 1992-11-23 |
| dc.description | The authors present a calculation of the Lyapunov exponent for transverse magnon modes in a Heisenberg spin-glass chain with positive and negative exchange interactions, both analytically as a microcanonical average and also numerically in the usual canonical statistical ensemble. In the positive- omega regime they find that the localization length obeys xi ( omega ) varies as omega <sup>-1</sup> at omega to 0 if p>q, where p, q=1-p are the +1 and -1 spin concentrations, respectively. It is shown that the previously reported xi ( omega ) varies as omega <sup>-2/3</sup> singularity, related to the anomalous dispersion law omega varies as k<sup>3/2</sup>, holds only in the limit of equal concentrations p=q=0.5. The corresponding densities of states diverge as rho ( omega ) varies as omega <sup>-1/2</sup> and varies as omega <sup>-1/3</sup> for p>q and p=q, respectively. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | The Lyapunov exponent for magnons in binary spin-glass chains |
| Тип | lett |
| DOI | 10.1088/0953-8984/4/47/002 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 4 |
| Первая страница | L617 |
| Последняя страница | L622 |
| Аффилиация | S N Evangelou; Res. Centre of Crete, FORTH, Greece |
| Аффилиация | A Z Wang; Res. Centre of Crete, FORTH, Greece |
| Выпуск | 47 |
