Two Kinds of Cylindrical Fermi Surface Determined by de Haas–van Alphen Experiments in NpCoGa<sub>5</sub>

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  • Aoki Dai
    Institute for Materials Research, Tohoku University
  • Homma Yoshiya
    Institute for Materials Research, Tohoku University
  • Shiokawa Yoshinobu
    Institute for Materials Research, Tohoku University Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Yamamoto Etsuji
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Nakamura Akio
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Settai Rikio
    Graduate School of Science, Osaka University
  • Onuki Yoshichika
    Advanced Science Research Center, Japan Atomic Energy Research Institute Graduate School of Science, Osaka University

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  • Two Kinds of Cylindrical Fermi Surface Determined by de Haas-van Alphen Experiments in NpCoGa5

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We succeeded in observing de Haas–van Alphen (dHvA) oscillations in an antiferromagnet NpCoGa5 with a tetragonal structure. The dHvA signal was significantly enhanced at higher fields than the metamagnetic transition field Hm (=43 kOe for H||[001]), where the antiferromagnetic state is changed into the field-induced ferromagnetic (paramagnetic) state. In the paramagnetic state, the Fermi surface was found to consist of two kinds of cylindrical main Fermi surface and small pocket Fermi surfaces. The cyclotron masses of the main Fermi surfaces were considerably large, ranging from 6 to 12m0. This is the first case where the Fermi surface was determined experimentally in transuranium compounds.

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