General behavior of chalcogenides of rare-earth metals in transition to the intermediate valence state under high pressures

High-precision measurements of the electric resistance, thermopower, and volume of TmS, TmSe, and TmTe under hydrostatic pressures up to 8.5 GPa were conducted. Comparison of the behavior of the electron-transport characteristics and volume of TmTe and SmTe in the electron transition region demonstr...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2014-10, Vol.90 (16), Article 165141
Main Authors: Tsiok, O. B., Khvostantsev, L. G., Golubkov, A. V., Smirnov, I. A., Brazhkin, V. V.
Format: Article
Language:English
Subjects:
Analogies
Chalcogenides
Condensed matter
Electron density
Electron transitions
Electronics
Hydrostatic pressure
Rare earth metals
Samarium
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Summary:High-precision measurements of the electric resistance, thermopower, and volume of TmS, TmSe, and TmTe under hydrostatic pressures up to 8.5 GPa were conducted. Comparison of the behavior of the electron-transport characteristics and volume of TmTe and SmTe in the electron transition region demonstrates a complete analogy up to the quantitative coincidence. We found that the thermopower of all samarium and thulium chalcogenides in the lattice-collapse region and during the subsequent reconstruction of the electronic spectrum obeys the universal dependence, which corresponds to the intersection of the Fermi level with the peak of the electron density of states. The results obtained testify in favor of the exciton nature of the intermediate valence state in chalcogenides of the rare-earth metals.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.90.165141