Mean-field model for magnetic orders in NpTGa5 with T = Co, Ni, or Rh

Annamária Kiss, Yoshio Kuramoto

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)


Characteristics of magnetic transitions in NpTGa5 with T = Co, Ni, Rh are explained in a unified way with use of a crystalline electric field (CEF) model of localized 5f4 electrons. The model takes a CEF doublet and a singlet as local states, and includes dipolar and quadrupolar intersite interactions in the mean-field theory. Diverse ordering phenomena are derived depending on the magnitude of interaction parameters, which qualitatively reproduce the experimentally observed magnetic behaviors in NpTGa5. The quadrupole degrees of freedom are essential to the diverse magnetic orders. It is argued that NpRhGa5 is close to a multicritical point where quadrupoles and dipoles with different directions are competing to order.

Original languageEnglish
Article number034709
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - 2006 Mar
Externally publishedYes


  • Actinide
  • Crystalline electric field
  • Magnetic order
  • Np
  • Quadrupolar interaction

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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