The Mossbauer Study of the Ferrous Ion in FeCl_2

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The Mossbauer spectra of Fe^<57> in FeCl_2 have been measured over the temperature range of 1.5°K-530°K. The temperature dependence of the observed e^2qQ/2 is fairly strong. Even below the Neel temperature of 24°K, the spectra showed only two absorption lines due to the electrc field gradient at the iron nucleus and did not show any typical patern of six absorption lines due to the internal magnetic field. The quadrupole splitting changed abruputly by about 30% through the Neel temperature. The parameters obtained are as follows; e^2qQ/2=0.80 mm/sec, δ=1.26 mm/sec at room temperature (above the Neel temperature) and e^2qQ/2=1.36 mm/sec, δ=1.50 mm/sec and H_<int>=0±8 koe at liquid helium temperature (below the Neel temperature). These characteristic features are ccmpletely explained with the following Hamiltonian for ferrous ion in the orbital tripet; H=λ'lS-△(l_2^2-2/3)一2Jx<S_z>S_z with the values of λ'=95 cm^<-1>, △=119cm^<-1> and 2J_x=7.3cm^<-1>.
社団法人日本物理学会の論文
1964-11-05