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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Acknowledgements
We gratefully acknowledge financial support from the Austrian Science Fund (FWF, project I 623-N16 and doctoral program W1243 Solids4Fun), the European Research Council (FP7/2007-2013/ERC grant agreement no. 227378) and the Deutsche Forschungsgemeinschaft (SPP 1386). JLJ acknowledges the FRC/URC of the UJ for funding of a postdoctoral fellowship under the joint supervision of S. Paschen and A. Strydom.
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Hänel, J., Winkler, H., Ikeda, M. et al. Anisotropic Thermopower of the Kondo Insulator \(\hbox {CeRu}_4\hbox {Sn}_6\) . J. Electron. Mater. 43, 2440–2443 (2014). https://doi.org/10.1007/s11664-014-3139-9
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DOI: https://doi.org/10.1007/s11664-014-3139-9