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Electron paramagnetic resonance of Fe 3+ in gallium borate: Superposition model analysis
Author(s) -
Seleznyova Kira,
Strugatsky Mark,
Yagupov Sergey,
Postivey Natalia,
Artemenko Alla,
Kliava Janis
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201350359
Subject(s) - electron paramagnetic resonance , zeeman effect , chemistry , spectral line , superposition principle , gallium , paramagnetism , hamiltonian (control theory) , ion , electron nuclear double resonance , boron , nuclear magnetic resonance , condensed matter physics , physics , magnetic field , mathematics , quantum mechanics , mathematical optimization , organic chemistry
A series of high quality Fe x Ga 1− x BO 3 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 Fe 3+ 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 Fe 3+ ligand coordinates has revealed the existence of a certain degree of local disorder in Fe x Ga 1− x BO 3 single crystals.