First Observation of the de Haas-van Alphen Effect in NpNiGa15

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  • Aoki Dai
    Institute for Materials Research, Tohoku University
  • Yamamoto Etsuji
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • 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
  • 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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  • First Observation of the de Haas-van Alphen Effect in NpNiGa5
  • First Observation of the de Haas–van Alphen Effect in NpNiGa<sub>5</sub>

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Abstract

We succeeded in observing the de Haas–van Alphen (dHvA) oscillations in NpNiGa5 single crystals, which were grown by the Ga-flux method. This is the first dHvA observation in transuranium compounds. The cyclotron effective masses were moderately enhanced, ranging from 1.8 to 4.9m0 (m0: rest mass of an electron). From an intensive change of the dHvA amplitude at 80–90 kOe and the temperature dependence of the electrical resistivity, NpNiGa5 is most likely an antiferromagnet with a Néel temperature, TN=30 K.

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