The Magnetic Properties of Cupric Formate Tetrapydrate at Low Temperatures
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概要
- 論文の詳細を見る
The magnetic susceptibility of single crystals of Cu(HCO_2)_2・4H_2O was measured at temperatures between 1.4°K and 80°K by a. c. bridge and magnetic balance method. This salt is an example of the magnetic two dimensional lattice. The interaction between Cu^<2+> ions is mainly the superexchange interaction through a formate ion in the same layer. From the Weiss constant of about -150°K, it is concluded that strength of superexchange interaction through a formate molecule, -(O-CH-O)-, has the same order as that through one diamagnetic atomic ion such as -(Cl)-. The existence of a broad maximum of the susceptibility at about 60°K implies the appearance of short range order in the two dimensional lattice. The antiferromagnetic transition accompanied by parasitic ferromagnetism was found at 17.0°K±0.2°K. The weak ferromagnetic moment in L_1L_2 plane was about 150 c. g. s. e. m. u. at 0°K. Along L_3 axis, no ferromagnetic moment was found. The susceptibility of isomorphous Cu(HCO_2)_2・2H_2O・2(NH_2)_2CO was similar to that of Cu(HCO_2)2・4H_2O.
- 東北大学の論文
著者
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Kobayashi Hanako
The Research Institute For Iron Steel And Other Metals
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Haseda Taiichiro
The Research Institute For Iron Steel And Other Metals
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