Bulk- and Surface-Sensitive High-Resolution Photoemission Study of Two Mott-Hubbard Systems : SrVO3 and CaVO3

• Eguchi, Ritsuko

• Kiss, Takayuki

• Tsuda, Shunsuke

• Shimojima, Takahiro

• Mizokami, Tomohiro

• Yokoya, Takayoshi

• Chainani, Ashish

• Shin, Shik

• Inoue, Isao H.

• Togashi, Tadashi

• Watanabe, Shuntaro

• Zhang, C. Q.

• Chen, C. T.

• Arita, Masashi

• Shimada, Kenya

• Namatame, Hirofumi

• Taniguchi, Masaki

抄録

We study the electronic structure of Mott-Hubbard systems SrVO3 and CaVO3 with bulk and surface-sensitive high-resolution photoemission spectroscopy, using a vacuum ultraviolet laser, synchrotron radiation, and a discharge lamp (hν=7–21 eV). A systematic suppression of the density of states (DOS) within ~0.2 eV of the Fermi level (EF) is found on decreasing photon energy, i.e., on increasing bulk sensitivity. The coherent band in SrVO3 and CaVO3 is shown to consist of surface and bulk-derived features, separated in energy. The stronger distortion on surface of CaVO3 compared to SrVO3 leads to a higher surface metallicity in the coherent DOS at EF, consistent with recent theory.

収録刊行物

• Physical Review Letters

  Physical Review Letters 96 (7), 076402-1-076402-4, 2006-02-23

  American Physical Society

キーワード

• photoemission
• binding energy
• photoelectron spectra
• strontium compounds
• calcium compounds
• electronic density of states
• Fermi level
• strongly correlated electron systems

詳細情報

• CRID: 1050859215940589952
• NII論文ID: 120000880587
• NII書誌ID: AA00773679
• Web Site: http://ir.lib.hiroshima-u.ac.jp/00019352
• 本文言語コード: en
• 資料種別: journal article
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