In-gap state generated by La-on-Sr substitutional defects within the bulk of SrTiO3

Yoshihiro Aiura, Kenichi Ozawa, Yasuhisa Tezuka, Makoto Minohara, Akane Samizo, Kyoko Bando, Hiroshi Kumigashira, Kazuhiko Mase

研究成果: Article査読

抄録

Local distortion in the conduction pathway has a significant influence on the conducting properties of oxides. The electronic states induced in the band gap of SrTiO3 by La doping were investigated using photoemission spectroscopy (PES) and soft X-ray emission spectroscopy (SXES); moreover, the local distortion in the conduction pathway was examined using extended X-ray absorption fine structure (EXAFS). An itinerant state and a localized state were observed as a metallic state and an in-gap state, respectively, in the PES spectra and as inelastic peaks in the SXES spectra. This implied that the itinerant state and the in-gap state coexisted within the bulk. From EXAFS results, it was observed that La doped into SrTiO3 substituted Sr and locally distorted the conduction pathway. The results showed that some electrons doped by La-on-Sr substitution are trapped/localized by the local distortion in the conduction pathway, whereas the remaining doped electrons itinerate in the pristine conduction pathway with no distortion.

本文言語English
ページ(範囲)14646-14653
ページ数8
ジャーナルPhysical Chemistry Chemical Physics
21
27
DOI
出版ステータスPublished - 2019

ASJC Scopus subject areas

  • 物理学および天文学(全般)
  • 物理化学および理論化学

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