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High-resolution angle-resolved photoemission study of incommensurate charge-density-wave compound Ce Te 3

2004; American Physical Society; Volume: 70; Issue: 19 Linguagem: Inglês

10.1103/physrevb.70.195101

1550-235X

H. Komoda, T. Sato, S. Souma, T. Takahashi, Yuki Ito, K. Suzuki,

Iron-based superconductors research

High-resolution angle-resolved photoemission spectroscopy (ARPES) has been performed on layered cerium trichalcogenide $\mathrm{Ce}{\mathrm{Te}}_{3}$ to study the incommensurate charge-density-wave (CDW) mechanism. We found that ARPES spectra near the Fermi level along the superlattice direction ($\ensuremath{\Gamma}\mathrm{Y}$ direction) show existence of multiple shadow bands due to the CDW formation, while those along the $\ensuremath{\Gamma}\mathrm{X}$ direction perpendicular to $\ensuremath{\Gamma}\mathrm{Y}$ do not show such a band folding. The energy dispersion of shadow bands is understood in terms of the momentum transfer due to the periodic lattice distortion vector. The observed sizable CDW gap amplitude $(>250\phantom{\rule{0.3em}{0ex}}\mathrm{meV})$ around Y point is in accordance with the observation of higher order shadow bands.