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Journal of Physical Studies 4(3), 313–317 (2000)
DOI: https://doi.org/10.30970/jps.04.313 SPECIFIC HEAT AND TRANSPORT PROPERTIES OF SmIn3E. Leyarovski, L. Leyarovska, C. Popov, M. Baychev, K. Kalaydjiev, M. Kirov
Laboratory of Low Temperatures and Magnetism, |
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The specific heat of polycrystalline SmIn$_{3}$ has been measured over the temperature range of 0.5 K to 25 K. At 15.2 K it revealed a $λ $-type anomaly which was associated with the antiferromagnetic (AFM) phase transition. Below 11 K the specific heat showed the usual temperature dependence expressed by the formula $Cp=γ T+δ T^{3}$, the last term being the sum of the lattice ($β T^{3}$) and the magnetic ($α T^{3}$) specific heats. The entropy related to the transition was close to the value $S=R\ln 4,$ which was expected for the lowest laying crystalline field quartet. The thermal and electrical conductivity of SmIn$_{3}$ (polycrystal), as well as of polycrystalline samples of LaIn$_{3}$ was measured in the temperature range between 4 K and 40 K. The crystal-field Lorenz number was calculated from the magnetic contributions to the thermal and electrical conductivity. It turned out to be a decreasing function of temperature as a result of different effects of inelastic scattering on the thermal and electrical kinetic coefficients.
PACS number(s): 71.70.-d, 75.20.-g