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ID 19346
本文ファイル
著者
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
キーワード
iron
titanium compounds
photoelectron spectra
electrical resistivity
intercalation compounds
Brillouin zones
Fermi level
抄録(英)
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).
掲載誌名
Physical Review B - Condensed Matter and Materials Physics
73巻
8号
開始ページ
085111-1
終了ページ
085111-6
出版年月日
2006-02-16
出版者
American Physical Society
ISSN
0163-1829
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2006 The American Physical Society.
関連情報URL
部局名
理学研究科
先端物質科学研究科
放射光科学研究センター