Magnetic and Fermi Surface Properties of the Ferromagnetic Compound UGa_2 : Electronic Properties, etc.

概要

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We have studied the magnetic and Fermi surface properties in a ferromagnet UGa_2. The electrical resistivity, elastic constant, thermal expansion coefficient, thermoelectric power, magnetic susceptibility and Hall coefficient indicate highly anisotropic properties, reflecting the hexagonal structure. The 5f^2- and 5f^3-CEF schemes, based on the localized 5f-electron nature, are discussed to understand the magnetic susceptibility and magnetization data. We have also done the magnetoresistance and de Haas-van Alphen (dHvA) experiments to investigate the Fermi surface properties. Both data are very complicated, implying that the Fermi surface is a multiply-connected one. They are explained neither by the localized 5f^2- and 5f^3-core models nor by the spin-polarized 5f-itinerant model. The cyclotron mass is, however, rather light, ranging from 0.17 to 6.2 _0, which is consistent with the electronic specific heat coefficient of 11 mJ/K^2・mol.
社団法人日本物理学会の論文
2000-08-15