Abstract
The temperature dependence of heat capacity C p(T) was studied for nine rare-earth hexaborides MB6(M=La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, and Dy) at temperatures of 5–300 K. Using the correspondence principle for lattice heat capacities of isostructural compounds, the lattice contribution C 1(T) and the excess contribution ΔC(T) to the heat capacity of the hexaborides were determined. The lattice heat capacity C 1(T) is represented as the sum of the Debye contributions of the metal and boron sublattices: C 1(T)=C M (T)+6C B(T). The Debye temperatures πM and πB of the metal and boron sublattices were determined. The anomalies in the excess heat capacity ΔC(T)=C p (T)−C 1(T) are related to the magnetic ordering effects, the Schottky contribution, and the Jahn-Teller effect.
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Translated from Fizika Tverdogo Tela, Vol. 43, No. 2, 2001, pp. 289–292.
Original Russian Text Copyright © 2001 by Novikov.
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Novikov, V.V. Components of the low-temperature heat capacity of rare-earth hexaborides. Phys. Solid State 43, 300–304 (2001). https://doi.org/10.1134/1.1349478
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DOI: https://doi.org/10.1134/1.1349478