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Effect of Monoclinic Symmetry on the EPR Spectra of Gd 3+ ‐Doped Hydrated Single Crystals of Rare‐Earth Trichlorides
Author(s) -
Misra S. K.,
Rudowicz C.
Publication year - 1988
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.2221470226
Subject(s) - electron paramagnetic resonance , isostructural , monoclinic crystal system , hamiltonian (control theory) , doping , crystallography , chemistry , spectral line , ion , rare earth , condensed matter physics , molecular physics , physics , nuclear magnetic resonance , crystal structure , mineralogy , mathematics , quantum mechanics , organic chemistry , mathematical optimization
Room‐temperature X‐band EPR data for Gd 3+ ‐doped isostructural rare‐earth trichloride hexahydrates are analyzed using a rigorous least‐squares‐fitting procedure. Discussion of the three forms of spin Hamiltonian corresponding to the orientations of the two‐fold monoclinic symmetry axis C 2 parallel to the magnetic axes X , Y , and Z is provided. It is found that for, C 2 ∥ Y , a significantly lower value of χ 2 , representing the goodness of fit, is obtained. A discussion of the determination of degree of monoclinicity, as revealed by the spin Hamiltonian parameters, is provided. Systematics of the spin Hamiltonian parameters b 2 0and b 2 2 , as functions of the host–ion radius, are also studied.