Fermi Surface Reconstruction in CeTe2 Induced by Charge Density Wave: ARPES Study
Abstract
Electronic structures of a charge-density-wave CDW system CeTe2-xSbx (x=0, 0.05) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES). The observed Fermi surface (FS) agrees very well with the calculated FS for the undistorted CeTe2 both in shapes and sizes. The metallic states crossing the Fermi level(EF) are observed in ARPES. The carriers near EF have mainly the Te(1) 5p character, with the negligible contribution from Ce 4f states to the CDW formation. The supercell (shadow) bands and the corresponding very weak FS's are found to arise from band-folding due to the interaction with Ce-Te(2) layers. This work shows that the origin of the CDW formation in CeTe2 is the FS nesting and that the CDW modulation vector is along Gamma-X (QCDW ~ X)
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