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Magnon gap formation and charge density wave effect on thermoelectric properties in the SmNiC2 compound

Title
Magnon gap formation and charge density wave effect on thermoelectric properties in the SmNiC2 compound
Authors
Kim, Jin HeeRhyee, Jong-SooKwon, Yong Seung
DGIST Authors
Kwon, Yong Seung
Issue Date
2012-12-03
Citation
Physical Review B, 86(23)
Type
Article
Article Type
Article
ISSN
1098-0121
Abstract
We studied the electrical, thermal, and thermoelectric properties of the polycrystalline compound of SmNiC2. The electrical resistivity and magnetization measurement show the interplay between the charge density wave at TCDW=150 K and the ferromagnetic ordering of Tc=18K. Below the ferromagnetic transition temperature, we observed the magnon gap formation of Δâ‰4.3-4.4 meV by ρ(T) and Cp(T) measurements. The charge density wave is attributed to the increase of the Seebeck coefficient resulting in the increase of the power factor S2σ. The thermal conductivity anomalously increases with increasing temperature along the whole measured temperature range, which implies the weak attribution of Umklapp phonon scattering. The thermoelectric figure of merit ZT significantly increases due to the increase of the power factor at TCDW=150K. Here we argue that the competing interaction between electron-phonon and electron-magnon couplings exhibits the unconventional behavior of electrical and thermal properties. © 2012 American Physical Society.
URI
http://hdl.handle.net/20.500.11750/5340
DOI
10.1103/PhysRevB.86.235101
Publisher
American Physical Society
Related Researcher
  • Author Kwon, Yong Seung Quantum Functional Materials Laboratory
  • Research Interests High Tc Superconductors and magnetic materials; Thermoelectric Materials
Files:
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Collection:
Emerging Materials ScienceQuantum Functional Materials Laboratory1. Journal Articles


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