Thermal conductivity of REIn₃compounds

Abstract

The results of measurements of the thermal conductivity of REIn3 (RE = Pr, Nd, Dy, Ho, Tm) compounds as a function of the temperature in the interval 4–300 K in the absence and in the presence of an external magnetic field of 8 T are presented. Except for PRIn3 all the compounds are antiferromagnetic. YIn3 was also measured as a reference compound. The results were analysed in the paramagnetic phase, where an influence of the crystalline electric field on the thermal conductivity was found. Drastic changes in the thermal conductivity were observed and analysed in the vicinity of the Néel temperature and in the antiferromagnetic phases of the compounds. Below the Néel temperature an additional magnon contribution to the thermal conductivity was separated out.

Superconductivity in single-crystal

“…CeIn 3 has the AuCu 3 structure, which has inspired new studies of the AuCu 3 family of materials. Normal state properties have been measured in YIn 3 via de Haas-van Alphen experiments [6], thermal conductivity [7], and heat capacity [8], leaving it well characterized and a promising candidate for further exploration of the interplay between crystal structure and magnetic superconductivity.…”

Magnetotransport of La0.5Ba0.5MnO3

“…Assuming the validity of Matthiesen rule, 47,48 the full temperature dependence of the electrical resistivity might be written as a linear superposition of various temperature dependent terms representing various electron, phonon, magnon, scattering mechanisms, i.e., residual, impurities, grain boundaries, phonon ͑ϳT͒ above the Debye temperature, electron ͑ϳT 2 ͒, ferromagnetic magnon ͑ϳT 9/2 ͒, phonon ͑ϳT 5 ͒ below the Debye temperature, etc. Recall that the De- bye temperature is of the order of 300-700 K in manganites, thus much above the temperature regime hereby investigated.…”

“…Other temperature components can be imagined, 47,48 i.e., a T or T 5 , at high or low temperature, as in Gruneisen lawthe regime of validity depending on the Debye temperature, ϳ400 K. 48 However the deconvolution parameters of a ͑supposedly linear͒ combination, according to Mathiessen rule, could hardly be interpreted due to the complexity of the grain inner structure and the polygranular nature of the samples. It could also finally be discussed whether a Gruneisen form can be used for the background, in view of the grain boundaries requesting some complex averaging.…”

Influence of crystal field excitations on thermal and electrical resistivity of normal rare‐earth metals

“…The thermal conductivity was described by using models with two and three scattering sources () but no reference was made to the thermal resistivity, which is known to obey the Matthiessen rule () in case of appropriate model assumptions. The Matthiessen was applied successfully to study experimental results of the thermal resistivity of normal rare earth (RE) metals of . The results of () occurred to describe correctly the character of the temperature dependence and the order of the magnitude of the thermal conductivity of the compounds though the form of the formula for the thermal conductivity contradicted the validity of the Matthiessen rule.…”

“…In order to show the applicability of our formulae to describing real materials, we fit our results to the experimental thermal and electrical resistivity of DyIn () in the paramagnetic phase, i.e., above about 20 K. DyIn is cubic and metallic as required by our model assumptions, described in the next section. For fitting, we also use the formulae derived in Refs.…”