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Title: Atomic and electronic structures of single-layer FeSe on SrTiO 3(001): The role of oxygen deficiency

Using first-principles calculation, we propose an interface structure for single triple-layer FeSe on the SrTiO 3(001) surface, a high-T c superconductor found recently. The key component of this structure is the oxygen deficiency on the top layer of the SrTiO 3 substrate, as a result of Se etching used in preparing the high-T c 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 T c 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.
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Publication Date:
Publisher's Accepted Manuscript
Journal Name:
Physical Review. B. Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 87; Journal Issue: 22; Related Information: CHORUS Timestamp: 2017-06-21 10:17:05; Journal ID: ISSN 1098-0121
American Physical Society
Sponsoring Org:
Country of Publication:
United States
OSTI Identifier: