このエントリーをはてなブックマークに追加
ID 19346
file
creator
Cui, Xiaoyu
Negishi, Hiroshi
Titova, S. G.
Ohnishi, Akimasa
Higashiguchi, Mitsuharu
Miura, Yuichi
Hino, S.
Jahir, A. M.
Titov, A.
Bidadi, H.
Negishi, Saiko
Sasaki, Minoru
subject
iron
titanium compounds
photoelectron spectra
electrical resistivity
intercalation compounds
Brillouin zones
Fermi level
abstract
We present electrical resistivity (ρ) measurements for the intercalation compound Fex TiSe2 (0≤x<0.16) over the temperature range from 4.2 to 300 K, and angle-resolved photoemission spectra for x=0, 0.05, and 0.14 at 50 and 250 K (or 280 K). At 250 K, TiSe2 is a semimetal having hole pockets centered at the Γ point and electron pockets around the L points of the Brillouin zone. Upon intercalation, Fe-derived flat bands appear just below the Fermi energy, and the Se 4p derived bands forming hole pockets at the Γ point are lowered. At 50 K, band folding due to 2a×2a×2c superlattice is observed clearly near the L point for the host and x=0.05, while it vanishes for x=0.14, consistent with the ρ-T data. The critical concentration for the suppression of the superstructure (0.05< xc ≤0.075) can be explained reasonably well by the percolation threshold of a two-dimensional-trianglar lattice consisting of seven Ti atoms, which is estimated to 1 14 (=0.0714).
journal title
Physical Review B - Condensed Matter and Materials Physics
volume
Volume 73
issue
Issue 8
start page
085111-1
end page
085111-6
date of issued
2006-02-16
publisher
American Physical Society
issn
0163-1829
ncid
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2006 The American Physical Society.
relation url
department
Graduate School of Science
Graduate School of Advanced Sciences of Matter
Hiroshima Synchrotron Radiation Center