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http://dx.doi.org/10.4283/JKMS.2010.20.5.173

ARPES Study of Quasi-Two Dimensional CDW System CeTe2  

Kim, D.H. (Department of Physics, The Catholic University of Korea)
Lee, H.J. (Department of Physics, The Catholic University of Korea)
Kang, J.S. (Department of Physics, The Catholic University of Korea)
Kim, H.D. (Pohang Accelerator Laboratory, POSTECH)
Min, B.H. (Department of Physics, Sungkyunkwan University)
Kwon, Y.S. (Department of Physics, Sungkyunkwan University)
Kim, J.W. (Department of Physics, POSTECH)
Min, B.I. (Department of Physics, POSTECH)
Publication Information
Journal of the Korean Magnetics Society / v.20, no.5, 2010 , pp. 173-177 More about this Journal
Abstract
The electronic structure of charge-density-wave (CDW) system $CeTe_2$ has been investigated by using angle-resolved photoemission spectroscopy (ARPES). The clearly dispersive band structures are observed in the measured ARPES spectra, indicating the good quality of the single-crystalline sample employed in this study. The four-fold symmetric patterns are observed in the constant energy (CE) mappings, indicating the $2{\times}2$ lattice deformation in the Te(1) sheets. The observed CE images are similar to those of $LaTe_2$, suggesting that Ce 4f states have the minor contribution to the CDW formation in $CeTe_2$. This study reveals that the carriers near the Fermi level should have mainly the Te(1) 5p and Ce 5d character, that the Te(1) 5p bands contribute to the CDW formation, and that the Ce 5d bands cross the Fermi level even in the CDW state.
Keywords
$CeTe_2$; ARPES; band structure; Fermi surface; CDW;
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