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dc.contributor.author | Misra S. | |
dc.contributor.author | Andronenko S. | |
dc.date.accessioned | 2020-01-15T22:06:30Z | |
dc.date.available | 2020-01-15T22:06:30Z | |
dc.date.issued | 2019 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/156628 | |
dc.description.abstract | © Kazan Federal University (KFU). Full angular variations of Cu2+ EPR spectra in β-Mg2V2O7 (MgVO) and α-Zn2V2O7 (ZnVO) were recorded for orientations of external magnetic field in three mutually perpendicular planes at 120 K and 295 K, as well as in temperature range from 110 to 295 K at some chosen orientations of magnetic field. The principal values of the g2- and Ã2-tensors, as well as the orientations of their principal axes were determined from angular variations of EPR line positions in three mutually perpendicular planes, using a rigorous least square fitting procedure, especially adapted to the case of non-coincident principal axes of the Ã2-tensors for the monoclinic and triclinic point-group symmetries in MgVO and ZnVO crystals, respectively. This procedure uses the eigenvalues and eigenvectors of the spin-Hamiltonian matrix, which allows to determine the orientations of the principal axes of the g2 (Zeeman) and Ã2 (hyperfine-interaction)-tensors. It is found, that the principal values of g2- and Ã2-tensors of the Cu2+ ions are similar in the two crystals; however, the orientations of the principal axes of these tensors are significantly different from each other. This is because the Cu2+ ion in MgVO is 6-fold coordinated, whereas it is 5-fold coordinated in trigonal bipyramidal coordination in ZnVO. The principal values of the g2-tensor, so obtained, are exploited to determine the electronic ground state of the Cu2+ ion in these two crystals. | |
dc.subject | Cu 2+ | |
dc.subject | EPR | |
dc.subject | Pyrovanadates | |
dc.subject | Spin-Hamiltonian parameters | |
dc.title | A variable temperature EPR study of Cu<sup>2+</sup> doped single crystals of pyrovanadates β-Mg<inf>2</inf>V<inf>2</inf>O<inf>7</inf>, α-Zn<inf>2</inf>V<inf>2</inf>O<inf>7</inf>: Estimations of non-coincident g<sup>2</sup>-and Ã<sup>2</sup>-tensors | |
dc.type | Article | |
dc.relation.ispartofseries-issue | 5 | |
dc.relation.ispartofseries-volume | 21 | |
dc.collection | Публикации сотрудников КФУ | |
dc.source.id | SCOPUS-2019-21-5-SID85073391179 |