Journal of Electronic Materials

, Volume 43, Issue 6, pp 2440–2443 | Cite as

Anisotropic Thermopower of the Kondo Insulator \(\hbox {CeRu}_4\hbox {Sn}_6\)

  • J. HänelEmail author
  • H. Winkler
  • M. Ikeda
  • J. Larrea J.
  • V. Martelli
  • A. Prokofiev
  • E. Bauer
  • S. Paschen
Open Access


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.


Kondo insulator thermopower power factor anisotropic hybridization 



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.

Open Access

This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any Noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.


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© The Author(s) 2014

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • J. Hänel
    • 1
    Email author
  • H. Winkler
    • 1
  • M. Ikeda
    • 1
  • J. Larrea J.
    • 1
    • 2
  • V. Martelli
    • 1
  • A. Prokofiev
    • 1
  • E. Bauer
    • 1
  • S. Paschen
    • 1
  1. 1.Institute of Solid State PhysicsVienna University of TechnologyViennaAustria
  2. 2.Department of PhysicsUniversity of JohannesburgAuckland ParkSouth Africa

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