The Study of Hyperfine Interactions in KCoF_3

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The hyperfine interactions in KCoF_3 have been studied by measurements of the nuclear magnetic resonance shifts of the F^<19> nucleus in the single crystal specimen. The measurements were performed at room temperature and the frequency used was 34.826Mc/s. The external magnetic field was rotated in the (001) plane, and both isotropic and anisotropic sbifts were observed. The isotropic hyperfine constant A_s and the anisotropic one A_σ-A_π were calculated using the resonance formula for F^<19> nucleus hν=g_Nβ_N(H_0+H_D)-[A_s+(A_σ-A_π)(3cos^2θ_ζ-1)]・2<S_z>, in which the first is the Zeeman term and the second is the hyperfine interaction term. The spin expectation value for Co^<2+><S_2> was calculated from our early experimental values of susceptibility using Kanamori's theory for CoO. The obtained A_s and A_0-A_π are (2.73±0.06)x10^<-3>cm^<-1> and (8.2±0.4)×10^<-4>cm^<-1> respectively. From these we can calculate the fractions of unpaired spins in the 2_s and 2_p orbitals of F- to be, f_s=(0.55±0.01)% and f_σ-f_π=(5.7±0.3)%. The effects caused by the unusual electronic characteristics of 3d orbitals of Co^<2+> are briefly discussed.
社団法人日本物理学会の論文
1964-09-05