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EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensors B4 and B6
Authors
Abdulsabirov R.
Antonova I.
+6 more
Galeev A.
Khasanova N.
Korableva S.
Nizamutdinov I.
Nizamutdinov N.
Stepanov V.
Publication date
1 January 1997
Publisher
Abstract
In single crystal colquiriite LiCaAlF6 doped with Gd3+ ions two EPR spectra of the Gd3+ ions with the Laue site-symmetry groups Ci and C3i were observed. The spectrum angular dependence for trigonal Gd3+ centre was investigated in detail and corresponding spin Hamiltonian parameters were fitted. From analysis of the spin Hamiltonian tensors B4 and B6 it was established that Gd3+ with the Laue group C3i substitutes at Ca2+ site with the excess charge compensation by an ion located along the threefold axis from this site. The transformation formulas for a sixth-rank irreducible Hermitian tensor under coordinate rotation are tabulated in an explicit form. By using the EPR data for Gd3+ substituted in a variety of host crystals, the fourth-rank and sixth-rank tensors of Gd3+ spin Hamiltonians were tabulated and correlated with structures of the coordination polyhedra at substitution sites. The results suppose a predominance of quadratic crystal field contributions into the spin Hamiltonian tensor B4 of Gd3+. © Springer-Verlag 1997
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Last time updated on 07/05/2019