Electronic Localization and Two-Dimensional Metallic State in UPt_2Si_2(Condensed matter: electronic structure and electric, magnetic, and optical properties)

概要

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We present a detailed study of the physical properties of single crystalline UPt_2Si_2. By neutron diffraction we establish the presence of frozen-in strain disorder on the Pt(2)/Si(2) ligand sites within the tetragonal crystal structure. Further, the system undergoes an antiferromagnetic transition at T_N=32K. In the range T_N<T<T_<irr>≃36K we observe a cluster glass like phase as result of the disorder. The highly anomalous behavior of the electronic transport properties-metallic along the tetragonal a and localized along the c axis-is a result of the specific type of disorder. Altogether, UPt_2Si_2 emerges as a model compound to study disorder effects in f electron intermetallics.
社団法人日本物理学会の論文
2008-02-15