31P-NMR study of the neptunium-based filled-skutterudite NpFe4P12

Yo Tokunaga, Dai Aoki, Yoshiya Homma, Hironori Sakai, Hiroyuki Chudo, Shinsaku Kambe, Tatsuma D. Matsuda, Shyugo Ikeda, Etsuji Yamamoto, Akio Nakamura, Yoshinori Haga, Yoshinobu Shiokawa, Yoshichika Onuki, Hiroshi Yasuoka

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


31P-NMR experiments have been performed on a single crystal of NpFe4P12 with applied fields parallel to the 〈111〉 direction for the cubic crystal axis. From K-χ plot above 20 K, the isotropic and anisotropic components of the hyperfine coupling constants between Np-5f electrons and P nuclei have been estimated. A relatively large value of the isotropic component suggests the importance of a transferred hyperfine mechanism through the 3s orbitals of P atoms. In the ferromagnetic ordered state, an additional NMR line splitting associated with the reorientation of the Np moments has been observed below T* = 19 K. Analysis of the NMR line splitting reveals that the Np-5f moments are ferromagnetically aligned along the applied field above T*, while they are reoriented along the ferromagnetic easy-axis of the 〈100〉 direction below T*.

Original languageEnglish
Pages (from-to)211-213
Number of pages3
Journaljournal of the physical society of japan
Issue numberSUPPL.A
Publication statusPublished - 2008


  • Filled-skutterudite
  • NMR
  • Transuranium

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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