Magnetic Phase Diagram and Metal-Insulator Transition of NiS_<2-x>Se_x : Condensed Matter: Electronic Properties, etc.

概要

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Magnetic phase diagram of NiS_<2-x>Se_x has been reexamined by systematic studies of electrical resistivity, uniform magnetic susceptibility and neutron diffraction using single crystals grown by a chemical transport method. The electrical resistivity and the uniform magnetic susceptibility exhibit the same feature of temperature dependence over a wide Se concentration. A distinct first order metal-insulator (M-I) transition accompanied by a volume change was observed only in the antiferromagnetic ordered phase for 0.50 ≤ x ≤ 0.59. In this region, the M-I transition makes substantial effects to the thermal evolution of staggered moments. In the paramagnetic phase, the M-I transition becomes broad; both the electrical resistivity and the uniform magnetic susceptibility exhibit a broad maximum around the temperatures on the M-I transition-line extrapolated to the paramagnetic phase.
社団法人日本物理学会の論文
2000-05-15