Electron paramagnetic resonance of Fe3+ in gallium borate: Superposition model analysis

A series of high quality FexGa1−xBO3 single crystals with 0 ≤ x ≤ 1 was prepared and studied by electron magnetic resonance in the temperature range from 4 to 290 K. At low x, only the electron paramagnetic resonance (EPR) of diluted Fe3+ ions is present. The EPR spectra for different orientations o...

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Bibliographic Details
Published in:physica status solidi (b) 2014-07, Vol.251 (7), p.1393-1400
Main Authors: Seleznyova, Kira, Strugatsky, Mark, Yagupov, Sergey, Postivey, Natalia, Artemenko, Alla, Kliava, Janis
Format: Article
Language:English
Subjects:
Condensed Matter
Fe3+ electron paramagnetic resonance
gallium borate
Physics
spin Hamiltonian
superposition model
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Summary:A series of high quality FexGa1−xBO3 single crystals with 0 ≤ x ≤ 1 was prepared and studied by electron magnetic resonance in the temperature range from 4 to 290 K. At low x, only the electron paramagnetic resonance (EPR) of diluted Fe3+ ions is present. The EPR spectra for different orientations of the magnetizing field have been computer simulated. With a conventional spin Hamiltonian including the Zeeman and fine‐structure terms, two different sets of best‐fit parameters have been found. This ambiguity has been resolved on the basis of the general spin Hamiltonian with parameters determined from the crystallographic data using the Newman superposition model. A detailed fitting to the experimental EPR spectra assuming statistical distributions of Fe3+ ligand coordinates has revealed the existence of a certain degree of local disorder in FexGa1−xBO3 single crystals.
ISSN:0370-1972
1521-3951
DOI:10.1002/pssb.201350359