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Title: Enhanced thermoelectric power and electronic correlations in RuSe{sub 2}

We report the electronic structure, electric and thermal transport properties of Ru{sub 1−x}Ir{sub x}Se{sub 2} (x ≤ 0.2). RuSe{sub 2} is a semiconductor that crystallizes in a cubic pyrite unit cell. The Seebeck coefficient of RuSe{sub 2} exceeds −200 μV/K around 730 K. Ir substitution results in the suppression of the resistivity and the Seebeck coefficient, suggesting the removal of the peaks in density of states near the Fermi level. Ru{sub 0.8}Ir{sub 0.2}Se{sub 2} shows a semiconductor-metal crossover at about 30 K. The magnetic field restores the semiconducting behavior. Our results indicate the importance of the electronic correlations in enhanced thermoelectricity of RuSb{sub 2}.
Authors:
; ; ; ;  [1] ; ;  [2] ;  [1] ;  [3]
  1. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  2. Photon Sciences Directorate, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  3. (United States)
Publication Date:
OSTI Identifier:
22415276
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CONCENTRATION RATIO; CORRELATIONS; DENSITY OF STATES; ELECTRIC CONDUCTIVITY; ELECTRONIC STRUCTURE; FERMI LEVEL; IRIDIUM COMPOUNDS; MAGNETIC FIELDS; PYRITE; RUTHENIUM SELENIDES; SEMICONDUCTOR MATERIALS; THERMAL CONDUCTIVITY; THERMOELECTRICITY