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Title: Strain control of oxygen vacancies in epitaxial strontium cobaltite films

Abstract

In this study, the ability to manipulate oxygen anion defects rather than metal cations in complex oxides can facilitate creating new functionalities critical for emerging energy and device technologies. However, the difficulty in activating oxygen at reduced temperatures hinders the deliberate control of important defects, oxygen vacancies. Here, strontium cobaltite (SrCoOx) is used to demonstrate that epitaxial strain is a powerful tool for manipulating the oxygen vacancy concentration even under highly oxidizing environments and at annealing temperatures as low as 300 °C. By applying a small biaxial tensile strain (2%), the oxygen activation energy barrier decreases by ≈30%, resulting in a tunable oxygen deficient steady-state under conditions that would normally fully oxidize unstrained cobaltite. These strain-induced changes in oxygen stoichiometry drive the cobaltite from a ferromagnetic metal towards an antiferromagnetic insulator. The ability to decouple the oxygen vacancy concentration from its typical dependence on the operational environment is useful for effectively designing oxides materials with a specific oxygen stoichiometry.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [1];  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1246773
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Advanced Functional Materials
Additional Journal Information:
Journal Volume: 26; Journal Issue: 10; Journal ID: ISSN 1616-301X
Publisher:
Wiley
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Jeen, Hyoung Jeen, Choi, Woo Seok, Reboredo, Fernando A., Freeland, John W., Eres, Gyula, Lee, Ho Nyung, Petrie, Jonathan R., Mitra, Chandrima, and Meyer, Tricia L. Strain control of oxygen vacancies in epitaxial strontium cobaltite films. United States: N. p., 2016. Web. doi:10.1002/adfm.201504868.
Jeen, Hyoung Jeen, Choi, Woo Seok, Reboredo, Fernando A., Freeland, John W., Eres, Gyula, Lee, Ho Nyung, Petrie, Jonathan R., Mitra, Chandrima, & Meyer, Tricia L. Strain control of oxygen vacancies in epitaxial strontium cobaltite films. United States. doi:10.1002/adfm.201504868.
Jeen, Hyoung Jeen, Choi, Woo Seok, Reboredo, Fernando A., Freeland, John W., Eres, Gyula, Lee, Ho Nyung, Petrie, Jonathan R., Mitra, Chandrima, and Meyer, Tricia L. Mon . "Strain control of oxygen vacancies in epitaxial strontium cobaltite films". United States. doi:10.1002/adfm.201504868. https://www.osti.gov/servlets/purl/1246773.
@article{osti_1246773,
title = {Strain control of oxygen vacancies in epitaxial strontium cobaltite films},
author = {Jeen, Hyoung Jeen and Choi, Woo Seok and Reboredo, Fernando A. and Freeland, John W. and Eres, Gyula and Lee, Ho Nyung and Petrie, Jonathan R. and Mitra, Chandrima and Meyer, Tricia L.},
abstractNote = {In this study, the ability to manipulate oxygen anion defects rather than metal cations in complex oxides can facilitate creating new functionalities critical for emerging energy and device technologies. However, the difficulty in activating oxygen at reduced temperatures hinders the deliberate control of important defects, oxygen vacancies. Here, strontium cobaltite (SrCoOx) is used to demonstrate that epitaxial strain is a powerful tool for manipulating the oxygen vacancy concentration even under highly oxidizing environments and at annealing temperatures as low as 300 °C. By applying a small biaxial tensile strain (2%), the oxygen activation energy barrier decreases by ≈30%, resulting in a tunable oxygen deficient steady-state under conditions that would normally fully oxidize unstrained cobaltite. These strain-induced changes in oxygen stoichiometry drive the cobaltite from a ferromagnetic metal towards an antiferromagnetic insulator. The ability to decouple the oxygen vacancy concentration from its typical dependence on the operational environment is useful for effectively designing oxides materials with a specific oxygen stoichiometry.},
doi = {10.1002/adfm.201504868},
journal = {Advanced Functional Materials},
number = 10,
volume = 26,
place = {United States},
year = {2016},
month = {1}
}

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