The regimes of charge transport in CeB6

A detailed study of resistivity (p), Hall (RH) and Seebeck (S) coefficients for high-quality single crystals of CeB6 has been carried out in a wide range of temperatures 1.8-300K. An anomalous behavior of all transport characteristics (p, RH, S) was found in the vicinity of T*approximate to 80K for a first time. The strong increase of resistivity p which follows to a weak localization relation p similar to T-1/eta (critical index 1/eta = 0.39 +/- 0.02) in the interval 7-80 K as well as an unusual asymptotic behavior of Seebeck coefficient S(T)similar or equal to Ig T and the pronounced (similar to 3 times) reduction of the Hall mobility mu(H) values observed below T* allowed us to conclude in favor of crossover between different regimes of charge carriers transport in CeB6 at T*. The low temperature anomalies of the charge transport characteristics are compared with the predictions of the Kondo-lattice model. (c) 2006 Elsevier B.V. All rights reserved.