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작성일 : 12-12-18 09:56
박사과정 김진희 PRB에 논문 출판
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   http://prb.aps.org/abstract/PRB/v86/i23/e235101 [5205]
박사 2학기 김진희가 이번에 Physical Review B에 논문출판을 하였습니다.

제목: Magnon gap formation and charge density wave effect on thermoelectric properties in the
SmNiC2 compound (Phys. Rev. B vol.86 p.235101, 2012)

저자: Jin Hee Kim,1 Jong-Soo Rhyee,1,* and Yong Seung Kwon2,†

초록: 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 = 18 K. Below the ferromagnetic transition temperature,
we observed the magnon gap formation of   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 = 150 K. Here we argue that
the competing interaction between electron-phonon and electron-magnon couplings exhibits the unconventional
behavior of electrical and thermal properties.


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