First observation of the de Haas-van Alphen effect in NpNiGa5

Dai Aoki, Etsuji Yamamoto, Yoshiya Homma, Yoshinobu Shiokawa, Akio Nakamura, Yoshinori Haga, Rikio Settai, Yoshichika Onuki

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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 80-90kOe and the temperature dependence of the electrical resistivity, NpNiGa5 is most likely an antiferromagnet with a Néel temperature, TN = 30K.

Original languageEnglish
Pages (from-to)519-522
Number of pages4
JournalJournal of the Physical Society of Japan
Issue number3
Publication statusPublished - 2004 Mar


  • De Haas-van Alphen effect
  • NpNiGa
  • Transuranium compound


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