[Zurück]

H. Winkler:
"Electrical resistivity and magnetization measurements of the Kondo insulator CeRu4Sn6";
Poster: NGSCES 2012 - The new generation in strongly correlated electron systems conference, Portoroz, Slowenien; 24.06.2012 - 29.06.2012.

Electrical resistivity and magnetization measurements of
the Kondo insulator CeRu4Sn6
Hannes Winkler1
1 Vienna University of Technology, Inst. of Solid State Phys.
Recently, specific heat and magnetization measurements on single crystalline
CeRu4Sn6 have revealed pronounced anisotropies [1], suggesting that this compound
may be a nodal Kondo insulator. Anisotropy was not only found along the principal
crystal directions (tetragonal a- and c-direction), but also within a quasi-cubic cell arising
in this compound because the lattice parameter c in the [001]-direction matches the
lattice spacing c´ in the [110]-direction by Δ(c-c´)/c = 0.2 %.
Here we present results of electrical resistivity and magnetization measurements on
single crystalline CeRu4Sn6 samples between 25 mK and several hundred degree above
room temperature along the different crystal directions (a, c, and c´). The anisotropy
in the electrical resistivity and magnetization is seen over the whole temperature range:
almost isotropic behaviour within the tetragonal a-a plane (including c´), but clearly
distinct behaviour for the out-of-plane direction c. These findings are analyzed in terms
of a doubly-gapped state and a nodal or directional gap of this compound, and discussed
in the context of previous results on polycrystals [2-4].
We gratefully acknowledge financial support from the European Research Council/
ERC Advanced Grant No 227378.
[1] S. Paschen et al., J. Phys.: Conf. Ser. 200, 012156 (2010).
[2] A.M. Strydom et al., J. Magn. Magn. Mater. 310, 377 (2007).
[3] E.M. Brüning et al., J. Magn. Magn. Mater. 310, 393 (2007).
[4] E.M. Brüning et al., Phys. Rev. B 82, 125115 (2010).