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Title: Oxygen Displacement in Cuprates under IonicLiquid Field-Effect Gating

Abstract

Here, we studied structural changes in a 5 unit cell thick La1.96Sr0.04CuO4 film, epitaxially grown on a LaSrAlO4 substrate with a single unit cell buffer layer, when ultra-high electric fields were induced in the film by applying a gate voltage between the film (ground) and an ionic liquid in contact with it. Measuring the diffraction intensity along the substrate-defined Bragg rods and analyzing the results using a phase retrieval method we obtained the three-dimensional electron density in the film, buffer layer, and topmost atomic layers of the substrate under different applied gate voltages. The main structural observations were: (i) there were no structural changes when the voltage was negative, holes were injected into the film making it more metallic and screening the electric field; (ii) when the voltage was positive, the film was depleted of holes becoming more insulating, the electric field extended throughout the film, the partial surface monolayer became disordered, and equatorial oxygen atoms were displaced towards the surface; (iii) the changes in surface disorder and the oxygen displacements were both reversed when a negative voltage was applied; and (iv) the c-axis lattice constant of the film did not change in spite of the displacement of equatorial oxygenmore » atoms.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [5]
  1. Victoria Univ. of Wellington (New Zealand); Brookhaven National Lab. (BNL), Upton, NY (United States); Ecole Polytechnique Federale Lausanne (Switzlerland)
  2. Hebrew Univ. of Jerusalem (Israel). Racah Inst. of Physics
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  4. Yale Univ., New Haven, CT (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Ecole Polytechnique Federale Lausanne (Switzlerland)
  7. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation (SNSF); Ecole Polytechnique Federale de Lausanne (EPFL); United States - Israel Binational Science Foundation (BSF)
OSTI Identifier:
1303018
Alternate Identifier(s):
OSTI ID: 1335398; OSTI ID: 1345805
Report Number(s):
BNL-112502-2016-JA; BNL-111836-2016-JA
Journal ID: ISSN 2045-2322; R&D Project: MA509MACA; KC0203020
Grant/Contract Number:  
SC00112704; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; condensed-matter physics; materials for devices

Citation Formats

Dubuis, Guy, Yacoby, Yizhak, Zhou, Hua, He, Xi, Bollinger, Anthony T., Pavuna, Davor, Pindak, Ron, and Bozovic, Ivan. Oxygen Displacement in Cuprates under IonicLiquid Field-Effect Gating. United States: N. p., 2016. Web. https://doi.org/10.1038/srep32378.
Dubuis, Guy, Yacoby, Yizhak, Zhou, Hua, He, Xi, Bollinger, Anthony T., Pavuna, Davor, Pindak, Ron, & Bozovic, Ivan. Oxygen Displacement in Cuprates under IonicLiquid Field-Effect Gating. United States. https://doi.org/10.1038/srep32378
Dubuis, Guy, Yacoby, Yizhak, Zhou, Hua, He, Xi, Bollinger, Anthony T., Pavuna, Davor, Pindak, Ron, and Bozovic, Ivan. Mon . "Oxygen Displacement in Cuprates under IonicLiquid Field-Effect Gating". United States. https://doi.org/10.1038/srep32378. https://www.osti.gov/servlets/purl/1303018.
@article{osti_1303018,
title = {Oxygen Displacement in Cuprates under IonicLiquid Field-Effect Gating},
author = {Dubuis, Guy and Yacoby, Yizhak and Zhou, Hua and He, Xi and Bollinger, Anthony T. and Pavuna, Davor and Pindak, Ron and Bozovic, Ivan},
abstractNote = {Here, we studied structural changes in a 5 unit cell thick La1.96Sr0.04CuO4 film, epitaxially grown on a LaSrAlO4 substrate with a single unit cell buffer layer, when ultra-high electric fields were induced in the film by applying a gate voltage between the film (ground) and an ionic liquid in contact with it. Measuring the diffraction intensity along the substrate-defined Bragg rods and analyzing the results using a phase retrieval method we obtained the three-dimensional electron density in the film, buffer layer, and topmost atomic layers of the substrate under different applied gate voltages. The main structural observations were: (i) there were no structural changes when the voltage was negative, holes were injected into the film making it more metallic and screening the electric field; (ii) when the voltage was positive, the film was depleted of holes becoming more insulating, the electric field extended throughout the film, the partial surface monolayer became disordered, and equatorial oxygen atoms were displaced towards the surface; (iii) the changes in surface disorder and the oxygen displacements were both reversed when a negative voltage was applied; and (iv) the c-axis lattice constant of the film did not change in spite of the displacement of equatorial oxygen atoms.},
doi = {10.1038/srep32378},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = {2016},
month = {8}
}

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