EPR investigations of the superhyperfine interaction and of the zero-field splittings for cubic and tetragonal Gd3+centres at sixfold coordinated sites in AMF3crystals
- 10 January 1981
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 14 (1) , 67-81
- https://doi.org/10.1088/0022-3719/14/1/009
Abstract
In RbCaF3, CsCaF3, and RbCdF3 crystals the 8S Gd3+ ion is substituted for the sixfold coordinated Ca2+ or Cd2+ ions. The authors discuss the superhyperfine interaction with the ligands and the hexadecapolar crystal-field term for cubic centres. Tetragonal centres, in which the quadrupolar crystal field terms range from 1.5*10-4 to 0.3 cm-1, were obtained through uniaxial stress, a structural phase change below Tc, or charge compensation by vacancies and O2- impurities. The authors discuss this term by using theoretical results within an ionic model or an empirical superposition model proposed by Newman (1975).Keywords
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