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 |
|