Magnetoelastic anomalies in CeNiSn

Holtmeier, S.; Hinkel, C.; Aigner, Maximilian; Bruls, G.; Finsterbusch, D.; Wolf, B.; Aßmus, W.; Lüthi, B.

doi:10.1016/s0921-4526(97)81592-x

Cited by 5 publications

(1 citation statement)

References 17 publications

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“…The phonon mean free path l may be estimated from the relation ϭCvl/3, where C is the lattice specific heat and v the mean phonon velocity. Using the phonon contribution Cϭ␤T 3 with ␤ϭ0.49 mJ/K 4 mol of LaNiSn, 22 the sound velocities calculated from the elastic constants C 11 , C 22 , and C 33 of CeNiSn, 34 and our (T) data, we obtain l a ϭ31 m, l b ϭ66 m, and l c ϭ35 m at 1 K and values approximately one order of magnitude smaller at 4 K. From these values, which are much smaller than the smallest sample dimension of 0.65 mm, and from the quadratic temperature dependence of (T) it is clear that the regime of boundary scattering (ϰT 3 ) is not reached at these temperatures. Instead, the phonons are strongly scattered from charge carriers.…”

Section: Analysis and Discussionmentioning

confidence: 99%

Thermal-transport properties of CeNiSn

et al. 2000

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We present thermal-conductivity 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 and S are highly anisotropic. However, characteristic features that may be attributed to the opening of a pseudogap in the electronic density of states ͑DOS͒ 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 L/L 0 to a value distinctly higher than one is an interesting feature which deserves further investigation.

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Section: Analysis and Discussionmentioning

confidence: 99%