Abstract
Precision measurements of resistivity, thermopower, and volume are performed for TmS, TmSe, and TmTe under a hydrostatic pressure up to 8 GPa. Comparison of the transport properties and volume of TmTe and SmTe in the valence transition region demonstrates a complete analogy up to quantitative coincidence. It is shown that the thermopower of all thulium and samarium chalcogenides in the lattice collapse region and in subsequent rearrangement of the electron spectrum in a wide range of pressures follow a universal dependence corresponding the passage of the Fermi level through the peak of the density of states (DOS). The results are considered in the context of ideas about the exciton nature of the intermediate valence in chalcogenides of rare-earth metals.
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Original Russian Text © O.B. Tsiok, L.G. Khvostantsev, V.V. Brazhkin, 2015, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 147, No. 6, pp. 1244–1253.
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Tsiok, O.B., Khvostantsev, L.G. & Brazhkin, V.V. Universal behavior of chalcogenides of rare-earth metals in the transition to a state with intermediate valence at high pressures. J. Exp. Theor. Phys. 120, 1077–1084 (2015). https://doi.org/10.1134/S1063776115050222
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DOI: https://doi.org/10.1134/S1063776115050222