コバルトを添加した, 擬一次元的配列を持つスカンジウム銅化合物の構造と磁気的性質

概要

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Structure and magnetic properties of the Sc_2Cu_<2-x>Co_xO_5 system were investigated up to the solid solution limits x=0.4 and x=0.6. Undoped Sc_2Cu_2O_5 has, like isostructural Y_2Cu_2O_5, a magnetic structure with weak ferromagnetic coupling along the b-axis and strongly coupled Cu^<2+> chains parallel to the a-axis which were antiferromagnetically coupled below the neel temperature of 16 K. Doping with Co^<2+> caused the paramagnetic Curie temperature (θ_P) to decrease from the x=0 value of 40 K, making (θ_P) negative for x>0.2, and caused the Neel temperature to increase to about 35 K for x=0.4. Thus the interchain weak ferromagnetic coupling along the b-axis was weakened and the interchain antiferromagnetic coupling was strengthened, while the intrachain strong ferromagnetic coupling, which displays the one-dimensional spin-spin interaction, was not influenced by the Co doping. Room-temperature structure refinement for Sc_2Cu_<1.6> Co_<0.4>O_5 from neutron powder diffraction data indicated that random substitution of Co^<2+> for Cu^<2+> occurred and that the Cu-O-O-Cu interchain superexchange pathway was enhanced by geometric changes as x increased from x=0 to 0.4.
社団法人日本セラミックス協会の論文
1995-04-01