Abstract
We present thermal-conductivity and thermopower S measurements on high-quality single crystalline CeNiSn along the three crystallographic axes 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 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 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 again for all three directions. The saturation of the reduced Lorenz number 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