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Thermal conductivities of scandium, yttrium, and cerium between 2 and 20 K

Thermal conductivities of scandium, yttrium, and cerium between 2 and 20 K Contrary to what has been reported in the literature, the thermal conductivities between 2 and 20 K of scandium, yttrium, and cerium show a behavior which is typical of a normal nonmagnetic metal of low purity at temperatures T < 0.1θ (θ is the Debye temperature). For scandium and yttrium the thermal conductivity can be separated into a linear (T) and a very small quadratic (T 2) contribution. The Lorenz numbers estimated from the linear terms are very close to the theoretical value L 0 = 2.45 × 10 −8 WΩ/K2 predicted by the Wiedemann-Franz law for pure electronic heat conduction limited by impurities. In cerium there is no apparent anomaly around the paramagnetic-antiferromagnetic transition of the Β-phase present. The Lorenz numbers calculated at 4.2 and 20 K have the values 2.68 × 10−8 and 3.83 × 10−8 WΩ/K2, respectively. It seems that in all the three samples, besides the usual predominant linear electronic conduction, a small contribution due to the phonons is present which in the case of scandium and yttrium reveals itself as a quadratic function of T. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Thermal conductivities of scandium, yttrium, and cerium between 2 and 20 K

Journal of Low Temperature Physics , Volume 20 (6) – May 19, 2004

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References (1)

Publisher
Springer Journals
Copyright
Copyright
Subject
Physics; Condensed Matter Physics; Characterization and Evaluation of Materials; Magnetism, Magnetic Materials
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/BF00120875
Publisher site
See Article on Publisher Site

Abstract

Contrary to what has been reported in the literature, the thermal conductivities between 2 and 20 K of scandium, yttrium, and cerium show a behavior which is typical of a normal nonmagnetic metal of low purity at temperatures T < 0.1θ (θ is the Debye temperature). For scandium and yttrium the thermal conductivity can be separated into a linear (T) and a very small quadratic (T 2) contribution. The Lorenz numbers estimated from the linear terms are very close to the theoretical value L 0 = 2.45 × 10 −8 WΩ/K2 predicted by the Wiedemann-Franz law for pure electronic heat conduction limited by impurities. In cerium there is no apparent anomaly around the paramagnetic-antiferromagnetic transition of the Β-phase present. The Lorenz numbers calculated at 4.2 and 20 K have the values 2.68 × 10−8 and 3.83 × 10−8 WΩ/K2, respectively. It seems that in all the three samples, besides the usual predominant linear electronic conduction, a small contribution due to the phonons is present which in the case of scandium and yttrium reveals itself as a quadratic function of T.

Journal

Journal of Low Temperature PhysicsSpringer Journals

Published: May 19, 2004

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