Crystal Field Study of Gd(3+)-Doped La(x)RE(1-x)F3 (RE=Ce,Pr,Nd) Single Crystals
MARIE-CURIE SKTODOWSKA UNIV LUBLIN (POLAND) INST OF PHYSICS
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The mixed LaxRE1-xF3 RE Ce, Pr, Nd single crystals doped with Gd3 0.1 mol were grown by a modified Bridgmann-Stockbarger method. The crystal field was investigated using electron paramagnetic resonance technique. The angular dependencies of Gd3 sup 8 S sub 72, f sup 7 line positions with magnetic field oriented in 001 plane were measured in the temperature range 4.2 - 295 K. The surroundings of Gd3 ions were investigated analyzing spin-hamiltonian parameters in the light of the superposition model. The small distortion of the D sup 4 sub 3d trigonal symmetry has been observed in LaF3, La0.9Ce0.1F3 and La0.9Nd0.1F3 below 150 K. The local structure deformation of the site symmetry of Gd3 ions induced by temperature starts at about 150 K becoming larger at 4.2 K. In PrF3 the distortion was not observed in the temperature range 4.2 - 295 K. The results were compared with those of Gd3-doped LiYF4 crystals.
- Physical Chemistry