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Chem.Mater. 1994,6, 1867-1874 1867 Quasi-Two-DimensionalMetallic Character of SmzTes

Summary: Chem.Mater. 1994,6, 1867-1874 1867
Quasi-Two-DimensionalMetallic Character of SmzTes
and SmTes
E.DiMasi, B. Foran, M. C. Aronson,*and S. Lee*
Departments of Chemistry and Physics, University of Michigan, Ann Arbor, Michigan 48109
Received May 3, 1994. Revised Manuscript Received June 27, 1994@
We demonstratethat the rare-earch polychalcogenides Sm2Te5and SmTe3are metals and
despite optimal Fermi surface nesting contain undistorted tellurium square lattice sheets.
Our resistivity measurements reveal an extremely large electrical anisotropy for both Sm
polytellurides. Single-crystal X-ray structure refinements of both phases show highly
isotropic metallic tellurium atoms. Magnetic susceptibility measurements reveal that the
Sm valence is close to 3. For SmTe3 and SmzTe5the resistivity perpendicular to the plane
of the layers is quadratic in temperature, with P coefficients which are 5-6 orders of
magnitude largerthan those of simple metals. These results firmly establish that the rare-
earth polychalcogenides as a family span the metal-insulator boundary.
One of the abiding interests in materials chemistry
is the synthesis and characterization of new materials
that are near the metal-insulator boundary. Such
materials exhibit important properties such as high and


Source: Aronson, Meigan - Department of Physics and Astronomy, SUNY at Stony Brook


Collections: Materials Science; Physics