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Title: Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3

Abstract

Remarkable enhancement of the superconducting transition temperature ( T c) has been observed for monolayer (ML) FeSe films grown on SrTiO 3 substrates. The atomic-scale structure of the FeSe/SrTiO 3 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/SrTiO 3 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/SrTiO 3.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [5]; ORCiD logo [4]; ORCiD logo [1]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [6]
  1. 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
  2. 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
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
  4. 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
  5. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  6. 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
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); US Air Force Office of Scientific Research (AFOSR)
OSTI Identifier:
1626043
Alternate Identifier(s):
OSTI ID: 1631021; OSTI ID: 1671310
Report Number(s):
BNL-215942-2020-JAAM
Journal ID: ISSN 2375-2548
Grant/Contract Number:  
AC02-06CH11357; SC0012704; FA9550-15-1-0472
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 15; Journal ID: ISSN 2375-2548
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Peng, Rui, Zou, Ke, Han, M. G., Albright, Stephen D., Hong, Hawoong, Lau, Claudia, Xu, H. C., Zhu, Yimei, Walker, F. J., and Ahn, C. H. Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3. United States: N. p., 2020. Web. doi:10.1126/sciadv.aay4517.
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. Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3. United States. https://doi.org/10.1126/sciadv.aay4517
Peng, Rui, Zou, Ke, Han, M. G., Albright, Stephen D., Hong, Hawoong, Lau, Claudia, Xu, H. C., Zhu, Yimei, Walker, F. J., and Ahn, C. H. Wed . "Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3". United States. https://doi.org/10.1126/sciadv.aay4517. https://www.osti.gov/servlets/purl/1626043.
@article{osti_1626043,
title = {Picoscale structural insight into superconductivity of monolayer FeSe/SrTiO 3},
author = {Peng, Rui and Zou, Ke and Han, M. G. and Albright, Stephen D. and Hong, Hawoong and Lau, Claudia and Xu, H. C. and Zhu, Yimei and Walker, F. J. and Ahn, C. H.},
abstractNote = {Remarkable enhancement of the superconducting transition temperature (Tc) 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-Tc 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-Tc mechanism in FeSe/SrTiO3.},
doi = {10.1126/sciadv.aay4517},
url = {https://www.osti.gov/biblio/1626043}, journal = {Science Advances},
issn = {2375-2548},
number = 15,
volume = 6,
place = {United States},
year = {2020},
month = {4}
}

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