Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO3

Peng, Rui; Zou, Ke; Han, M. G.; Albright, Stephen D.; Hong, Hawoong; Lau, Claudia; Xu, H. C.; Zhu, Yimei; Walker, F. J.; Ahn, C. H.

doi:10.1126/sciadv.aay4517

Title: Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO₃

Journal Article · Wed Apr 08 00:00:00 EDT 2020 · Science Advances

DOI:https://doi.org/10.1126/sciadv.aay4517· OSTI ID:1626043

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Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena; Fudan Univ., Shanghai (China). Lab of Advanced Materials
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena; Yale Univ., New Haven, CT (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Yale Univ., New Haven, CT (United States). Dept. of Applied Physics; Yale Univ., New Haven, CT (United States). Center for Research on interface Structures and Phenomena; Yale Univ., New Haven, CT (United States). Dept. of Physics; Yale Univ., New Haven, CT (United States). Dept. of Mechanical Engineering and Materials Science

Remarkable enhancement of the superconducting transition temperature (T_c) has been observed for monolayer (ML) FeSe films grown on SrTiO₃ substrates. The atomic-scale structure of the FeSe/SrTiO₃ interface is an important determinant of both the magnetic and interfacial electron-phonon interactions and is a key ingredient to understanding its high-T_c superconductivity. We resolve the atomic-scale structure of the FeSe/SrTiO₃ interface through a complementary analysis of scanning transmission electron microscopy and in situ surface x-ray diffraction. We find that the interface is more strongly bonded for a particular registration, which leads to a coherently strained ML. We also determine structural parameters, such as the distance between ML FeSe and the oxide, Se–Fe–Se bond angles, layer-resolved distances between Fe–Se, and registry of the FeSe lattice relative to the oxide. This picoscale structure determination provides an explicit structural framework and constraint for theoretical approaches addressing the high-T_c mechanism in FeSe/SrTiO₃.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)

Grant/Contract Number:: AC02-06CH11357; SC0012704; FA9550-15-1-0472

OSTI ID:: 1626043

Alternate ID(s):: OSTI ID: 1631021; OSTI ID: 1671310

Report Number(s):: BNL-215942-2020-JAAM; TRN: US2200387

Journal Information:: Science Advances, Vol. 6, Issue 15; ISSN 2375-2548

Publisher:: AAASCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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References (52)

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