Low-temperature Transport Studies of the Filled Skutterudites Ce_yFe_4-xCo_xSb_12
Abstract
Thermoelectric and magnetic transport properties of the filled skutterudites Ce_yFe_4-xCo_xSb_12 (0<y<1, 0 <= x <= 3.5) have been studied in the temperature range from 3 to 300 K and magnetic field up to 5.5 T. For T < 100 K, some samples show an anomaly (hump) in the thermoelectric power vs. temperature S(T), which is distinct from a linear high-temperature dependence. An approach based on the Kondo phenomenon with intermediate valeny of Cerium is utilized to explain the thermopower anomaly at low temperature, and the fitting results show a very good agreement with the data over the temperature range. The low-temperature curvatures have also been observed in magnetic susceptibility and magnetoresistance measurements, which correlate with the thermopower anomaly at low-temperature and can be understood by crystalline field effects and mixed valency.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 1998
- Bibcode:
- 1998APS..MAR.M1505H