Atomic and electronic structures of single-layer FeSe on SrTiO(001): The role of oxygen deficiency
Open Access
- 6 June 2013
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 87 (22), 220503
- https://doi.org/10.1103/physrevb.87.220503
Abstract
Using first-principles calculation, we propose an interface structure for single triple-layer FeSe on the SrTiO(001) surface, a high- superconductor found recently. The key component of this structure is the oxygen deficiency on the top layer of the SrTiO substrate, as a result of Se etching used in preparing the high- samples. The O vacancies strongly bind the FeSe triple layer to the substrate giving rise to a (2×1) reconstruction, as observed by scanning tunneling microscopy. The enhanced binding correlates to the significant increase of observed in experiment. The O vacancies also serve as the source of electron doping, which modifies the Fermi surface of the first FeSe layer by filling the hole pocket near the center of the surface Brillouin zone, as suggested from angle-resolved photoemission spectroscopy measurement.
Keywords
Funding Information
- U.S. Department of Energy
- National Science Foundation
This publication has 28 references indexed in Scilit:
- Interface-Induced High-Temperature Superconductivity in Single Unit-Cell FeSe Films on SrTiO 3Chinese Physics Letters, 2012
- High-Temperature Cuprate SuperconductorsSpringer Series in Solid-State Sciences, 2010
- Superconductivity at 56 K in samarium-doped SrFeAsFJournal of Physics: Condensed Matter, 2009
- Superconductivity in the PbO-type structure α-FeSeProceedings of the National Academy of Sciences of the United States of America, 2008
- Superconductivity at 38 K in the Iron ArsenidePhysical Review Letters, 2008
- Superconductivity at 55 K in Iron-Based F-Doped Layered Quaternary Compound Sm[O
1-
x
F
x
] FeAsChinese Physics Letters, 2008
- Superconductivity at 43 K in SmFeAsO1-xF xNature, 2008
- Superconductivity at 43 K in an iron-based layered compound LaO1-xFxFeAsNature, 2008
- Iron-Based Layered Superconductor La[O1-xFx]FeAs (x = 0.05−0.12) with Tc = 26 KJournal of the American Chemical Society, 2008
- Iron-Based Layered Superconductor: LaOFePJournal of the American Chemical Society, 2006