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

Kyung Eun Lee, Byeong Hun Min, Jong Soo Rhyee, Jae Nyeong Kim, Ji Hoon Shim, Yong Seung Kwon

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4 Scopus citations

Abstract

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.

Original languageEnglish
Article number143901
JournalApplied Physics Letters
Volume101
Issue number14
DOIs
StatePublished - 1 Oct 2012

Bibliographical note

Funding Information:
YSK was supported by the Basic Science Research Program (2010-0007487) and the Mid-career Researcher Program (2010-0029136). JSR was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2011-0021335 and 2012R1A2A1A03005174), and TJ Park Junior Faculty Fellowship funded by the POSCO TJ Park Foundation. JHS was supported by Nano Material Technology Development Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0026762).

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