Structural Studies on the Quasi Two-Dimensional Mott System BaCo_<1-x>Ni_xS_<2-δ> by the X-Ray Rietveld Method

概要

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Structural parameters of BaCo_<1-x>Ni_xS_2(0 ≤ x ≤ 1) with quasi two-dimensional electrons have been determined by the X-ray Rietveld method. This sulfide exhibits the Mott transition with varying x. The interatomic distance between Co/Ni and S(1) at the apex site of a Co_<1-x> Ni_xS_5 square-pyramid increases with x, which is consistent with the electronic configuration (3d_<3z^2-r^2>)^<1+x> of Co/Ni ions. The structural data of BaCo_<0.9>Ni_<0.1>S_<1.85> show that the sulfur vacancies are within (Co/Ni)S planes.
社団法人日本物理学会の論文
1995-06-15