Friday, September 14, 2012

1209.2942 (V. Guritanu et al.)

Anisotropic optical conductivity of the putative Kondo insulator
CeRu$_4$Sn$_6$
   [PDF]

V. Guritanu, P. Wissgott, T. Weig, H. Winkler, J. Sichelschmidt, M. Scheffler, A. Prokofiev, S. Kimura, T. Iizuka, A. M. Strydom, M. Dressel, F. Steglich, K. Held, S. Paschen
Kondo insulators and in particular their non-cubic representatives have remained poorly understood. Here we report on the development of an anisotropic energy pseudogap in the tetragonal compound CeRu$_4$Sn$_6$ employing optical reflectivity measurements in broad frequency and temperature ranges, and local density approximation plus dynamical mean field theory calculations. The calculations provide evidence for a Kondo insulator-like response within the $a-a$ plane and a more metallic response along the c axis and qualitatively reproduce the experimental observations, helping to identify their origin.
View original: http://arxiv.org/abs/1209.2942

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