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Dimensional crossover of charge density wave and thermoelectric properties in CeTe2-xSbx single crystals

Dimensional crossover of charge density wave and thermoelectric properties in CeTe2-xSbx single crystals
Lee, KE[Lee, Kyung Eun]Min, BH[Min, Byeong Hun]Rhyee, JS[Rhyee, Jong-Soo]Kim, JN[Kim, Jae Nyeong]Shim, JH[Shim, Ji Hoon]Kwon, YS[Kwon, Yong Seung]
DGIST Authors
Min, BH[Min, Byeong Hun]Kwon, YS[Kwon, Yong Seung]
Issued Date
Article Type
3-Dimensional3-Dimensional StructuresCharge Density WavesDensity Functional TheoryDimensional CrossoverElectric ConductivityElectric Power FactorElectrical ResistivityElectronic StructureFermi SurfaceFermi Surface NestingGap OpeningHeavy-Hole BandsHole-DopingPower FactorsSingle CrystalsThermo-Electric PowerThermo-Electric Power FactorsThermo-Electric PropertiesThree Dimensional Computer Graphics
We have measured the electrical resistivity and Seebeck coefficient of CeTe2-xSbx(x = 0.0, 0.05, 0.1, 0.25, and 0.5) single crystals from 100 K to 300 K along the ab-plane, and we calculated their electronic structures and Fermi surfaces by using the density functional theory approach. The band structures of CeTe2show the 2-dimensional (2D) Fermi surface nesting behavior, which induce the charge density wave (CDW). In addition, there is a 3-dimensional (3D) electron Fermi surface hindering the perfect CDW gap opening. By hole doping with the substitution of Sb at the Te-site, the 3D-like Fermi surface disappears and the 2D perfect CDW gap opening enhances the power factor up to x = 0.1. With further hole doping, the Fermi surfaces become 3-dimensional structure with heavy hole bands. The enhancement of the power factor is observed near the dimensional crossover of CDW, at x = 0.1, where the CDW gap is maximized. Here we show the strong relationship between the dimensionality of CDW and high thermoelectric power factor. © 2012 American Institute of Physics.
American Institute of Physics Publishing
Related Researcher
  • 권용성 Kwon, Yong Seung 화학물리학과
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
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Department of Physics and Chemistry Quantum Functional Materials Laboratory 1. Journal Articles


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