Static and dynamic characteristics of the Cr.sup.3+./sup. EPR spectra in the Van Vleck paramagnet TmAl.sub.3./sub.(BO.sub.3./sub.).sub.4./sub.

0458954 - FZÚ 2017 RIV US eng J - Článek v odborném periodiku
Prokhorov, Andriy
Static and dynamic characteristics of the Cr³⁺ EPR spectra in the Van Vleck paramagnet TmAl₃(BO₃)₄.
Journal of Materials Science. Roč. 51, č. 10 (2016), 4762-4768. ISSN 0022-2461. E-ISSN 1573-4803
Grant CEP: GA MŠMT(CZ) LM2011029
Institucionální podpora: RVO:68378271
Klíčová slova: EPR spectra * rare-earth * aluminum borates * spin Hamiltonian parameters * Van Vleck paramagnet
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.599, rok: 2016

The advanced study of Cr3+ impurity ions in the Van Vleck paramagnet TmAl3(BO3)4 is reported in this work. The angular dependence of the electron paramagnetic resonance spectrum from Cr3+ ion has been studied in detail, and the parameters of spin Hamiltonian were evaluated at T = 11 K [g =1.980 ± 0.002; D = (-0.534 ± 0.001) cm-1; E = (0.027 ± 0.005) cm-1]. It was shown that the Cr3+ ions substitute trivalent aluminum ions and form a system of three magnetic equivalent ions rotated through 120˚ relative to each other. The deviation of the Zaxis from the C3-axis for Cr3+ ions was found to be 2.5˚. A significant temperature dependence of g and D parameters has been found. It was shown that a strong broadening of the EPR lines depends on the dipole and exchange fields generated by the magnetic moment of the thulium ion.
Trvalý link: http://hdl.handle.net/11104/0259161