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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]
- Issue Date
- Applied Physics Letters, 101(14)
- Article Type
- 3-Dimensional; 3-Dimensional Structures; Charge Density Waves; Density Functional Theory; Dimensional Crossover; Electric Conductivity; Electric Power Factor; Electrical Resistivity; Electronic Structure; Fermi Surface; Fermi Surface Nesting; Gap Opening; Heavy-Hole Bands; Hole-Doping; Power Factors; Single Crystals; Thermo-Electric Power; Thermo-Electric Power Factors; Thermo-Electric Properties; Three 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
Kwon, Yong Seung
Quantum Functional Materials Laboratory
High Tc Superconductors and magnetic materials; Thermoelectric Materials
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- Department of Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles
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