Abstract

The paramagnetic rare earth ions Yb 3+ , Ce 3+ and Gd 3+ and the transition metal ion Cr 3+ were investigated in the cubic elpasolite crystal Cs 2 NaYF 6 with ENDOR. The superhyperfine (shf) interaction parameters of the first 1 9F, 23 Na and 133 Cs shells were determined. In the case of Gd 3+ they were analyzed in an overlap model of the transferred hyperfine interaction including exchange polarisation.

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