Characteristic metamagnetic transitions in NpRhGa5 and UPtGa5

K. Sugiyama, H. Nakashimaa, T. Yamada, D. Aoki, S. Ikeda, Y. Haga, E. Yamamoto, A. Nakamura, Y. Homma, Y. Shiokawa, K. Kindo, M. Hagiwara, Y. Onuki

Research output: Contribution to journalArticlepeer-review


We measured the high-field magnetization up to 55 T and constructed a magnetic phase diagram for a transuranium antiferromagnet NpRhGa5 with the tetragonal structure. The magnetization at 4.2 K for an easy-axis H//[100] indicates a metamagnetic transition with a sharp step at Hc 26 T and saturates above Hs 38 T, reaching 0.43 μB/Np at Hs. On the other hand, the magnetization saturates at H s 28 T for a hard-axis H//[001], reaching 0.44 μB/Np at Hs. The magnetization indicated that the magnetic moment reduces from 0.96 μB/Np at zero field to 0.44 μB/Np at the saturation field as a function of magnetic field. These experimental results in NpRhGa5 are compared with the simple magnetism in UPtGa 5with the similar antiferromagnetic structure.

Original languageEnglish
Article number051
Pages (from-to)227-230
Number of pages4
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2006 Dec 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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