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Doping SrTiO3 supported FeSe by excess atoms and oxygen vacancies
Abstract
Photoemission studies of FeSe monolayer films on SrTiO3 substrate have shown electronic structures that deviate from pristine FeSe, consistent with heavy electron doping. With the help of first-principles calculations we studied the effect of excess Fe and Se atoms on the monolayer and oxygen vacancies in the substrate in order to understand the reported Fermi surface in this system. We find that both excess Fe and Se atoms prefer the same adsorption site above the bottom Se atoms on the monolayer. The adsorbed Fe is strongly magnetic and contributes electrons to the monolayer, while excess Se hybridizes with the monolayer Fe-d states and partially opens a gap just above the Fermi energy. We also find that the two-dimensional electron gas generated by the oxygen vacancies is partly transferred to the monolayer and can potentially suppress the hole pockets around the Γ point. Furthermore, both O vacancies in the SrTiO3 substrate and excess Fe over the monolayer can provide high levels of electron doping.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1201296
- Alternate Identifier(s):
- OSTI ID: 1201031
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 3; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Shanavas, Kavungal Veedu, and Singh, David J. Doping SrTiO3 supported FeSe by excess atoms and oxygen vacancies. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.92.035144.
Shanavas, Kavungal Veedu, & Singh, David J. Doping SrTiO3 supported FeSe by excess atoms and oxygen vacancies. United States. https://doi.org/10.1103/PhysRevB.92.035144
Shanavas, Kavungal Veedu, and Singh, David J. 2015.
"Doping SrTiO3 supported FeSe by excess atoms and oxygen vacancies". United States. https://doi.org/10.1103/PhysRevB.92.035144. https://www.osti.gov/servlets/purl/1201296.
@article{osti_1201296,
title = {Doping SrTiO3 supported FeSe by excess atoms and oxygen vacancies},
author = {Shanavas, Kavungal Veedu and Singh, David J.},
abstractNote = {Photoemission studies of FeSe monolayer films on SrTiO3 substrate have shown electronic structures that deviate from pristine FeSe, consistent with heavy electron doping. With the help of first-principles calculations we studied the effect of excess Fe and Se atoms on the monolayer and oxygen vacancies in the substrate in order to understand the reported Fermi surface in this system. We find that both excess Fe and Se atoms prefer the same adsorption site above the bottom Se atoms on the monolayer. The adsorbed Fe is strongly magnetic and contributes electrons to the monolayer, while excess Se hybridizes with the monolayer Fe-d states and partially opens a gap just above the Fermi energy. We also find that the two-dimensional electron gas generated by the oxygen vacancies is partly transferred to the monolayer and can potentially suppress the hole pockets around the Γ point. Furthermore, both O vacancies in the SrTiO3 substrate and excess Fe over the monolayer can provide high levels of electron doping.},
doi = {10.1103/PhysRevB.92.035144},
url = {https://www.osti.gov/biblio/1201296},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 3,
volume = 92,
place = {United States},
year = {Fri Jul 24 00:00:00 EDT 2015},
month = {Fri Jul 24 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
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