In-gap state generated by La-on-Sr substitutional defects within the bulk of SrTiO
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 SrTiO 3 by La doping were investigated using photoemission spectroscopy (PES) and soft X-ray emission spectroscopy (SXES); moreover, the loc...
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Veröffentlicht in: | Physical chemistry chemical physics : PCCP 2019-07, Vol.21 (27), p.14646-14653 |
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Zusammenfassung: | 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 SrTiO
3
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 SrTiO
3
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.
La-on-Sr substitution defects in SrTiO
3
generate electrons and simultaneously cause local distortion in the conduction pathway. |
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ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/c9cp02307k |