Magnetic Susceptibilities of Co^<2+> in KMgF_3 and Effects of Exchange Interaction

概要

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The measurements of the magnetic susceptibilities have been made in the temperature range of 1.5°K〜300°K for three KMg_<1-x>Co_xF_3 single crystals with x= 0.025, 0.050, and O.110. The temperature dependence of the magnetic susceptibilities at high temperatures can be explained from the Pryce's formula for a single Co^<2+> in an octahedral field. The deviations from the Pryce's formula are found at low temperatures. These deviations can be explained by the effect of the exchange interactions between the neighboring Co^<2+> in the crystals. By assuming that the Co^<2+> ions are randomly distributed in the Mg^<2+> site, the contributions from the various types of isolated clusters to the total susceptibility are calculated. The observed susceptibilities can be fitted to the calculated values, if the exchange interaction is taken as -J(s_〓・s_〓) with J equal to -70±10cm^<-1>, where s is the fictitious spin, 1/2, of the ground state of a single Co^<2+> in an octahedral field.
社団法人日本物理学会の論文
1967-03-05