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Anomalous charge transport in CeB6

Authors
Journal
Journal of Solid State Chemistry
0022-4596
Publisher
Elsevier
Publication Date
Volume
179
Issue
9
Identifiers
DOI: 10.1016/j.jssc.2006.01.016
Keywords
  • Kondo Lattice
  • Charge Transport

Abstract

Abstract The comprehensive study of conductivity σ, Hall coefficient R H and Seebeck coefficient S has been carried out on high-quality single crystals of CeB 6 in a wide range of temperatures 1.8–300 K. An anomalous behavior of all transport characteristics ( σ, R H, S) was found for the first time in the vicinity of T *≈80 K. The strong decrease of conductivity σ as well as the unusual asymptotic behavior of Seebeck coefficient S( T)∼−ln T observed below T * allowed us to conclude in favor of crossover between different regimes of charge transport in CeB 6. The pronounced change of Hall mobility μ H, which diminishes from the maximum value of 20 cm 2/(V s) at T * to the values of ∼6 cm 2/(V s) at T∼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.

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