Direct evidence of band modification and suppression of superstructure in TiSe2 upon Fe intercalation : An angle-resolved photoemission study

Physical Review B - Condensed Matter and Materials Physics 73 巻 8 号 085111-1-085111-6 頁 2006-02-16 発行
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タイトル ( eng )
Direct evidence of band modification and suppression of superstructure in TiSe2 upon Fe intercalation : An angle-resolved photoemission study
作成者
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
収録物名
Physical Review B - Condensed Matter and Materials Physics
73
8
開始ページ 085111-1
終了ページ 085111-6
抄録
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).
著者キーワード
iron
titanium compounds
photoelectron spectra
electrical resistivity
intercalation compounds
Brillouin zones
Fermi level
言語
英語
資源タイプ 学術雑誌論文
出版者
American Physical Society
発行日 2006-02-16
権利情報
Copyright (c) 2006 The American Physical Society.
出版タイプ Version of Record(出版社版。早期公開を含む)
アクセス権 オープンアクセス
収録物識別子
[ISSN] 0163-1829
[DOI] 10.1103/PhysRevB.73.085111
[NCID] AA11187113
[DOI] http://dx.doi.org/10.1103/PhysRevB.73.085111