| Автор | Osvaldo F Schilling |
| Автор | Luis Ghivelder |
| Дата выпуска | 2000-03-27 |
| dc.description | H-Nb<sub>2</sub> O<sub>5</sub> (Nb<sub>28</sub> O<sub>70</sub> ) is a semiconductor whose structure is built of NbO<sub>6</sub> octahedra, which share corners and edges to form blocks parallel to the basal ac plane of the structure. One unit cell contains two blocks of 3 × 4 and 3 × 5 octahedra displaced by 1/2 b -axis spacing, besides one further Nb atom located in tetrahedrally coordinated sites along channels parallel to the b axis. Such channels contain octahedral interstices which are the preferential sites for point defect segregation in this structure. The possibility of using the channels as a framework for obtaining oriented spin arrays has never been explored in the literature. To investigate which kind of magnetic interaction would arise we manufactured a sample of H-Nb<sub>2</sub> O<sub>5</sub> containing enough Fe to fill part of the octahedral interstices in the channels and measured the ac susceptibility response. The results were consistent with the formation of linear chains of spins, with variable coupling constants along the chains. The variable coupling can be understood as a consequence of the influence of the large number of possible arrangements of Nb and Fe atoms along the channels upon the sign and magnitude of superexchange interactions mediated by the oxygen atoms. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Magnetic properties of iron-doped channels in H-Nb<sub>2</sub>O<sub>5</sub> |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/12/321 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | 2825 |
| Последняя страница | 2832 |
| Выпуск | 12 |
