In-gap state generated by La-on-Sr substitutional defects within the bulk of SrTiO 3

In-gap state generated by La-on-Sr substitutional defects within the bulk of SrTiO 3

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 loca...

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Veröffentlicht in:Physical chemistry chemical physics : PCCP 2019-07, Vol.21 (27), p.14646-14653
Hauptverfasser: Aiura, Yoshihiro, Ozawa, Kenichi, Tezuka, Yasuhisa, Minohara, Makoto, Samizo, Akane, Bando, Kyoko, Kumigashira, Hiroshi, Mase, Kazuhiko
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container_end_page 14653
container_issue 27
container_start_page 14646
container_title Physical chemistry chemical physics : PCCP
container_volume 21
creator Aiura, Yoshihiro
Ozawa, Kenichi
Tezuka, Yasuhisa
Minohara, Makoto
Samizo, Akane
Bando, Kyoko
Kumigashira, Hiroshi
Mase, Kazuhiko
description 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.
doi_str_mv 10.1039/c9cp02307k
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title In-gap state generated by La-on-Sr substitutional defects within the bulk of SrTiO 3
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