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

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

2008-04-15

arxiv.org/abs/0804.2308v1

J. Phys. Soc. Jpn. 75 (2006) 034709

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, 10 figures

Scientific paper

10.1143/JPSJ.75.034709

Characteristics of magnetic transitions in NpTGa$_5$ with T=Co, Ni, Rh are explained in a unified way with use of a crystalline electric field (CEF) model of localized 5$f^4$ 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 NpTGa$_5$. The quadrupole degrees of freedom are essential to the diverse magnetic orders. It is argued that NpRhGa$_5$ is close to a multicritical point where quadrupoles and dipoles with different directions are competing to order.

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