Magnetic properties and heavy electronic states in the antiferromagnet NpPtGa5

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

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We succeeded in growing a new neptunium compound NpPtGa5 by the Ga-flux method, and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas-van Alphen (dHvA) effect. NpPtGa 5 orders antiferromagnetically below TN = 26 K. The magnetic moment is most likely directed along the [100] direction. A cylindrical Fermi surface was detected by the dHvA experiment in the antiferromagnetic state. The cyclotron masses are large, 17-21 m0, indicating the heavy electronic state in NpPtGa5. The large cyclotron masses are consistent with the large electronic specific heat coefficient, γ = 123 mJ/(K2·mol), which is the largest among NpTGa5 (T = Fe, Co, Rh, Ni, and Pt).

Original languageEnglish
Article number114715
JournalJournal of the Physical Society of Japan
Issue number11
Publication statusPublished - 2006 Nov


  • De Haas-van Alphen effect
  • Electrical resistivity
  • Magnetic susceptibility
  • Magnetization
  • NpPtGa
  • Specific heat
  • Transuranium compound


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