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준이차원 전하밀도파 CeTe₂의 각분해 광전자 분광 연구
김대현(D. H. Kim),이현진,강정수(J.-S. Kang),김형도(H.-D. Kim),민병훈(B. H. Min),권용성(Y. S. Kwon),김준원(J. W. Kim),민병일(B. I. Min) 한국자기학회 2010 韓國磁氣學會誌 Vol.20 No.5
The electronic structure of charge-density-wave (CDW) system CeTe₂ 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 × 2 lattice deformation in the Te(1) sheets. The observed CE images are similar to those of LaTe2, suggesting that Ce 4f states have the minor contribution to the CDW formation in CeTe₂. 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.