Magnetic and Fermi Surface Properties of the Ferromagnetic Compound UGa2

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  • Honma Tetsuo
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319–1195
  • Inada Yoshihiko
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
  • Settai Rikio
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
  • Araki Shingo
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
  • Tokiwa Yoshihumi
    Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043
  • Takeuchi Tetsuya
    Low Temperature Center, Osaka University, Toyonaka, Osaka 560–0043
  • Sugawara Hitoshi
    Department of Physics, Tokyo Metropolitan University, Minami–Ohsawa 1–1, Hachioji, Tokyo 192–0397
  • Sato Hideyuki
    Department of Physics, Tokyo Metropolitan University, Minami–Ohsawa 1–1, Hachioji, Tokyo 192–0397
  • Kuwahara Keitaro
    Department of Physics, Tokyo Metropolitan University, Minami–Ohsawa 1–1, Hachioji, Tokyo 192–0397
  • Yokoyama Makoto
    Graduate School of Science, Hokkaido University, Sapporo 060–0810
  • Amitsuka Hiroshi
    Graduate School of Science, Hokkaido University, Sapporo 060–0810
  • Sakakibara Toshiro
    Graduate School of Science, Hokkaido University, Sapporo 060–0810
  • Yamamoto Etsuji
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319–1195
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319–1195
  • Nakamura Akio
    Department of Materials Science, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319–1195
  • Harima Hisatomo
    The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567–0047
  • Yamagami Hiroshi
    Graduate School of Science, Tohoku University, Sendai 980–8578
  • Onuki Yoshichika
    Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Naka, Ibaraki 319–1195 Graduate School of Science, Osaka University, Toyonaka, Osaka 560–0043

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タイトル別名
  • Magnetic and Fermi Surface Properties of the Ferromagnetic Compound UGa<FONT SIZE="-1"><SUB>2</SUB></FONT>
  • Magnetic and Fermi Surface Properties of the Ferromagnetic Compound UGa<sub><b>2</b></sub>

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We have studied the magnetic and Fermi surface properties in a ferromagnet UGa2. The electrical resistivity, elastic constant, thermal expansion coefficient, thermoelectric power, magnetic susceptibility and Hall coefficient indicate highly anisotropic properties, reflecting the hexagonal structure. The 5f2- and 5f3-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 5f2- and 5f3-core models nor by the spin-polarized 5f-itinerant model. The cyclotron mass is, however, rather light, ranging from 0.17 to 6.2m0, which is consistent with the electronic specific heat coefficient of 11 mJ/K2·mol.

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