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EPR spectra of Cr 3+ ion in the Van Vleck paramagnet EuAl 3 (BO 3 ) 4
Author(s) -
Prokhorov A.D.,
Zubov E.E.,
Prokhorov A.A.,
Chernush L.F.,
Minyakaev R.,
Dyakonov V.P.,
Szymczak H.
Publication year - 2013
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.201248571
Subject(s) - electron paramagnetic resonance , ion , spectral line , ground state , chemistry , paramagnetism , hamiltonian (control theory) , atomic physics , condensed matter physics , nuclear magnetic resonance , physics , organic chemistry , astronomy , mathematical optimization , mathematics
We have presented new results on the EPR spectra and the ground state of the Cr 3+ ion replacing Y 3+ in YAl 3 (BO 3 ) 4 and Eu 3+ in EuAl 3 (BO 3 ) 4 single crystals. The EPR studies performed at frequencies of about 9.4 and 37 GHz in a temperature range of 300–4.2 K have revealed the peculiarities and differences of EPR spectra of Cr 3+ ion as well as determined the spin‐Hamiltonian parameters ( g ‐factors, D , and E fine‐structure parameters and their signs) in both crystals. The value and sign of the D parameter in both crystals are determined by both the nearest ligands around the Cr 3+ ion and the spin–orbit interaction. The interaction between Cr 3+ ion and rare‐earth ion weakly influences on the ground‐state splitting, while the changes of g ‐factors are mainly caused by the Cr 3+ and Eu 3+ ions interactions. The EPR spectra and contributions determining the value of spin‐Hamiltonian parameters were analyzed on the basis of the superposition model of the crystal field.