Anisotropic Thermopower of the Kondo Insulator \hbox {CeRu}_4\hbox {Sn}_6 |
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| Authors: | J Hänel H Winkler M Ikeda J Larrea J V Martelli A Prokofiev E Bauer S Paschen |
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| Affiliation: | 1. Institute of Solid State Physics, Vienna University of Technology, Wiedner Hauptstr. 8-10, 1040?, Vienna, Austria
2. Department of Physics, University of Johannesburg, Auckland Park, 2006, South Africa
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| Abstract: | The intermetallic compound \(\hbox {CeRu}_4\hbox {Sn}_6\) has been tentatively classified as Kondo insulator. This class of material, especially non-cubic representatives, is not yet fully understood. Here we report thermopower measurements on single-crystalline \(\hbox {CeRu}_4\hbox {Sn}_6\) between 2 K and 650 K, along the main crystallographic directions. Large positive thermopower is observed in the directions along which the hybridization is strong and a Kondo insulating gap forms. A negative contribution to the thermopower dominates for the crystallographic \(c\) axis where hybridization is weak and metallicity prevails. |
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