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Title: Universal behavior of chalcogenides of rare-earth metals in the transition to a state with intermediate valence at high pressures

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.
Authors:
; ;  [1]
  1. Russian Academy of Sciences, Vereshchagin Institute of High-Pressure Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22472216
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Experimental and Theoretical Physics; Journal Volume: 120; Journal Issue: 6; Other Information: Copyright (c) 2015 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COMPARATIVE EVALUATIONS; DENSITY OF STATES; ELECTRIC CONDUCTIVITY; ELECTRON SPECTRA; EXCITONS; FERMI LEVEL; PRESSURE DEPENDENCE; PRESSURE RANGE GIGA PA; THULIUM SELENIDES; THULIUM SULFIDES; THULIUM TELLURIDES; VALENCE