LOW-TEMPERATURE STRUCTURAL PHASE-TRANSITION IN MONOCLINIC RBDY(WO4)(2) CRYSTAL

Citation
Mt. Borowiec et al., LOW-TEMPERATURE STRUCTURAL PHASE-TRANSITION IN MONOCLINIC RBDY(WO4)(2) CRYSTAL, Acta Physica Polonica. A, 94(1), 1998, pp. 71-77
Citations number
9
Categorie Soggetti
Physics
Journal title
ISSN journal
05874246
Volume
94
Issue
1
Year of publication
1998
Pages
71 - 77
Database
ISI
SICI code
0587-4246(1998)94:1<71:LSPIMR>2.0.ZU;2-M
Abstract
The ESR spectrum of Dy3+ ion in the low-symmetry RbDy(WO4)(2) crystal has been studied in the temperature region of T = 4.2 divided by 30 K. The ESR linewidth was found to increase from 130 mT up to the maximum value of 190 mT at T = 9 It and then to decrease down to 150 mT at 4. 2 K. The components of the g-tensor change considerably without change of their spatial orientation in the temperature range from 12 K to 7 K: g(z) = 2.5, g(x) approximate to 0, g(y) = 1.41 at T > 12 K; g(z) = 1.53, g(x) approximate to 0, g(y) = 1.2 at T < 7 K. The observed X-sha ped behaviour of absorption linewidth and the decrease in the g-factor are assumed to be due to the low-temperature structural phase transit ion (T-SPT approximate to 9 K) The width of the transition area is of about 5 K. It is suggested that the symmetry of high- and low-temperat ure phases is identical.