Electronic Raman spectra of divalent cobalt ions in cadmium-chloride-type crystals
Abstract
The polarized Raman spectra of divalent cobalt ions at concentrations ranging from 2.5 to 10 wt% in cadmium chloride, cadmium bromide, manganese chloride, and cobalt chloride from 15 to 300°K are reported. All five electronic transitions between the spin-orbit and trigonal crystal-field-split levels of the 4T1g(4F) cubic-field ground term are observed with frequencies of 235, 499, 923, 953, and 1088 cm-1 for cadmium-chloride crystals containing 2.5-wt% cobalt. The strong-field matrices of the trigonal crystal field and the Zeeman interaction are calculated and quantitatively explain the experimental data. The d3 configuration parameter values for the cadmium-chloride crystals with 2.5-wt% cobalt are (in cm-1) Dq=-670, B=790, C=3320, ζ=-512, ζ'=-513, v=57, and v'=-345. EPR measurements on the cadimum-bromide crystals with 0.1-wt% cobalt yield new values of g∥=3.74+/-0.1 and g⊥=4.67+/-0.1 which resolve difficulties in fitting the experimental data for this crystal. Raman lines were also observed for antiferromagnetically ordered CoCl2.
- Publication:
-
Physical Review B
- Pub Date:
- December 1975
- DOI:
- 10.1103/PhysRevB.12.4656
- Bibcode:
- 1975PhRvB..12.4656C