Mean-Field Model for Magnetic Orders in NpTGa_5 with T=Co, Ni, or Rh (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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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 5f^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.
- 社団法人日本物理学会の論文
- 2006-03-15
著者
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KISS Annamaria
Department of Physics, Tohoku University
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Kiss Annamaria
Department Of Physics Tohoku University
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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