Magnetic and electrical properties in NpAl 4 and UAl 4

Dai Aoki, Yoshinori Haga, Yoshiya Homma, Yoshinobu Shtokawa, Etsuji Yamamoto, Akio Nakamura, Rikio Settat, Yoshichika Onuki

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9 Citations (Scopus)


We grew high-quality single crystals of NpAl 4, together with UAl 4, by the Al-flux method and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haasvan Alphen (dHvA) effect. NpAl 4 is an antiferromagnet with the Néel temperature T N =49K. The corresponding magnetic moment is most likely directed along the [010] direction in the orthorhombic crystal structure. The large magnetic entropy at T N and the Curie-Weiss behavior suggest the localized nature of 5f-electrons with the 5f 4 configuration. The detected dHvA frequencies in NpAL 4 are small, indicating that the small magnetic Brillouin zone is formed in the antiferromagnetic state. On the other hand, the large Fermi surfaces are observed in a paramagnet UA1 4. The detected cyclotron mass is relatively large, ranging from 3.4 to 23m 0 which is consistent with the electronic specific heat coefficient γ = 89mJ/(K 2-mol).

Original languageEnglish
Article number044712
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - 2009 Apr


  • De haasvan alphen effect
  • Electrical resistivity
  • Magnetic susceptibility
  • Magnetization
  • NpAl
  • Specific heat
  • UAl

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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