Low-temperature transport properties of the filled skutterudites CeFe{sub 4{minus}x}Co{sub x}Sb{sub 12}
- Department of Physics, University of Michigan, Ann Arbor, Michigan 48109 (United States)
- Physics and Physical Chemistry Department, General Motors Research and Development Center, Warren, Michigan 48090 (United States)
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109 (United States)
Thermal conductivity, thermoelectric power, electrical resistivity, Hall coefficient, and magnetic susceptibility of the filled skutterudites CeFe{sub 4{minus}x}Co{sub x}Sb{sub 12}, with x=0, 0.5, 1.0, 1.5, and 2.0, have been studied from 2 to 300 K. We find that the substitution of Co at Fe sites has a dramatic effect on all transport properties. While the resistivity of CeFe{sub 4}Sb{sub 12} has a metallic character, substitution of Co leads to a progressively stronger activated behavior and a decrease in hole concentration. The thermopower increases with increasing Co, while the thermal conductivity is depressed, notably at low temperatures. Susceptibility data suggest the presence of large effective moments. At high temperatures Ce is nearly trivalent, but valence fluctuations prevail at low temperatures. Strong hybridization of the Ce 4f states with the Fe 3d and pnicogen p states appears to be important in understanding the physical properties of these compounds. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 439053
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 55, Issue 3; Other Information: PBD: Jan 1997
- Country of Publication:
- United States
- Language:
- English
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