| Автор | A J B Codling |
| Автор | B Henderson |
| Дата выпуска | 1971-07-30 |
| dc.description | Paramagnetic resonance spectra are reported for V<sup>2+</sup> ions occupying orthorhombic symmetry sites in the cubic lattice of magnesium oxide. The local distortion from O<sub>h</sub> symmetry at the vanadium ion site is attributed to a cation vacancy located in a nearest neighbour position along a (110) direction. The spectra are composed of 'forbidden' Delta M<sub>s</sub>=+or-2 and Delta M<sub>s</sub>=+or-3 transitions in addition to the 'allowed' Delta M<sub>s</sub>=+or-1 transitions. The spectra which were recorded at microwave frequencies near 9.5 GHz and 35 GHz may be described by the spin Hamiltonian, H=g beta B.S+D(S<sub>z</sub><sup>2</sup>-<sup>1</sup>/<sub>3</sub> S(S+1))+E(S<sub>x</sub><sup>2</sup>-S<sub>y</sub><sup>2</sup>)+AI.S with g=1.9910 (isotropic), mod D mod =0.1819 cm<sup>-1</sup>, mod E mod =0.0419 cm<sup>-1</sup> and mod A mod =0.0072 cm<sup>-1</sup> (isotropic). The observed hyperfine structure is complicated by the presence of 'forbidden' lines, which become allowed off axis owing to the breakdown of the Delta M<sub>I</sub>=0 selection rule by the second order mixing of the fine structure and hyperfine structure terms. The spectrum from Cr<sup>3+</sup> in a similarly distorted site has been examined at 35 GHz, a frequency higher than those previously used. In contradistinction to X and K band measurements by other workers, all possible Delta M<sub>s</sub>=+or-1 transitions are observed. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Paramagnetic resonance studies of V<sup>2+</sup> and Cr<sup>3+</sup> in orthorhombic symmetry sites in magnesium oxide |
| Тип | paper |
| DOI | 10.1088/0022-3719/4/10/032 |
| Print ISSN | 0022-3719 |
| Журнал | Journal of Physics C: Solid State Physics |
| Том | 4 |
| Первая страница | 1242 |
| Последняя страница | 1250 |
| Аффилиация | A J B Codling; Keele Univ., UK |
| Аффилиация | B Henderson; Keele Univ., UK |
| Выпуск | 10 |
