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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.
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SYSNO ASEP 0458954 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Static and dynamic characteristics of the Cr3+ EPR spectra in the Van Vleck paramagnet TmAl3(BO3)4 Author(s) Prokhorov, Andriy (FZU-D) ORCID Source Title Journal of Materials Science. - : Springer - ISSN 0022-2461
Roč. 51, č. 10 (2016), 4762-4768Number of pages 7 s. Language eng - English Country US - United States Keywords EPR spectra ; rare-earth ; aluminum borates ; spin Hamiltonian parameters ; Van Vleck paramagnet Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects LM2011029 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 UT WOS 000372573000005 EID SCOPUS 84959086032 DOI 10.1007/s10853-015-9646-0 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2017
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