Thermal-transport properties of CeNiSn

S. Paschen, B. Wand, G. Sparn, F. Steglich, Y. Echizen, and T. Takabatake
Phys. Rev. B 62, 14912 – Published 1 December 2000
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Abstract

We present thermal-conductivity κ and thermopower S measurements on high-quality single crystalline CeNiSn along the three crystallographic axes a,b, and c in the temperature range between 100 mK and 7 K and in magnetic fields up to 8 T applied along the a axis. Both κ and S are highly anisotropic. However, characteristic features that may be attributed to the opening of a pseudogap in the electronic density of states (DOS) at the Fermi energy η below 10 K are seen for all three crystallographic directions. These features are strongly suppressed by a magnetic field of 8 T applied along the a axis. At the lowest temperatures we have evidence for the presence of a residual metallic DOS at η, again for all three directions. The saturation of the reduced Lorenz number L/L0 to a value distinctly higher than one is an interesting feature which deserves further investigation.

  • Received 17 July 2000

DOI:https://doi.org/10.1103/PhysRevB.62.14912

©2000 American Physical Society

Authors & Affiliations

S. Paschen, B. Wand, G. Sparn, and F. Steglich

  • MPI for Chemical Physics of Solids, Nöthnitzer Strasse 40, D-01187 Dresden, Germany

Y. Echizen and T. Takabatake

  • Department of Quantum Matter, ADSM, Hiroshima University, Kagamiyama 1-3-1, Higashi-Hiroshima 739-8526, Japan

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Vol. 62, Iss. 22 — 1 December 2000

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