Anomalous charge transport in CeB6

The comprehensive study of conductivity (7, Hall coefficient RH and Seebeck coefficient S has been carried out on high-quality single crystals of CeB6 in a wide range of temperatures 1.8-300 K. An anomalous behavior of all transport characteristics (sigma, R-H, S) was found for the first time in the vicinity of T* approximate to 80 K. The strong decrease of conductivity a as well as the unusual asymptotic behavior of Seebeck coefficient S(T)similar to-In T observed below T* allowed us to conclude in favor of crossover between different regimes of charge transport in CeB6. The pronounced change of Hall mobility mu(H), which diminishes from the maximum value of 20 cm(2)/(Vs) at T* to the values of similar to 6 cm(2)/(Vs) at T similar to 10 K, seems to be attributed to the strong enhancement of charge carriers scattering due to fast spin fluctuations on Ce-sites. The low-temperature anomalies of the charge transport characteristics are compared with the predictions of the Kondo-lattice model. (c) 2006 Elsevier Inc. All rights reserved.