Doping- and Strain-Dependent Electrolyte-Gate-Induced Perovskite to Brownmillerite Transformation in Epitaxial La1-xSrxCoO3-δ Films.

This readme.txt file was generated on by Recommended citation for the data: https://doi.org/10.1021/acsami.1c13828 ------------------- GENERAL INFORMATION ------------------- 1. Title of Dataset Doping- and Strain-Dependent Electrolyte-Gate-Induced Perovskite to Brownmillerite Transformation in Epitaxial La1-xSrxCoO3-d Film 2. Author Information Principal Investigator Contact Information Name:Chris Leighton Institution: 1Department of Chemical Engineering and Materials Science, University of Minnesota Address: 421 Washington Ave SE, Minneapolis, Minnesota 55455, USA Email: leighton@umn.edu ORCID: Minneapolis, Minnesota 55455, USA Associate or Co-investigator Contact Information Name: Institution: Address: Email: ORCID: Associate or Co-investigator Contact Information Name: Institution: Address: Email: ORCID: 3. Date published or finalized for release: 20211025 4. Date of data collection (single date, range, approximate date) 20201015 - 20210520 5. Geographic location of data collection (where was data collected?): Minneapolis,Argonne National Lab (Lemont) 6. Information about funding sources that supported the collection of the data: This work was supported primarily by the National Science Foundation through the University of Minnesota MRSEC under award number DMR-2011401. Parts of this work were performed in the Characterization Facility, UMN, which receives partial support from NSF through the MRSEC and NNCI programs. Portions of this work were also conducted in the Minnesota Nano Center, which is supported by NSF through the National Nano Coordinated Infrastructure (NNCI) under ECCS-2025124. Part of this work also used resources of the Advanced Photon Source, a DOE Office of Science User Facility operated by Argonne National Laboratory under contract no. DE-AC02-06CH11357. W.T. acknowledges support from the Polish National Agency for Academic Exchange under the Polish Returns 2019 Program, grant no. PPN/PPO/2019/1/00014, and the subsidy of the Ministry of Science and Higher Education of Poland. 7. Overview of the data (abstract): Much recent attention has focused on the voltage-driven reversible topotactic transformation between ferromagnetic metallic perovskite (P) SrCoO3-d and oxygen-vacancy-ordered antiferromagnetic insulating brownmillerite (BM) SrCoO2.5. This is emerging as a paradigmatic example of the power of electrochemical gating (using, e.g., ionic liquids/gels), the wide modulation of electronic, magnetic, and optical properties generating clear application potential. SrCoO3 films are challenging with respect to stability, however, and there has been little exploration of alternate compositions. Here, we present the first study of ion-gel-gating-induced P ® BM transformations across almost the entire La1-xSrxCoO3 phase diagram (0 £ x £ 0.70), under both tensile and compressive epitaxial strain. Electronic transport, magnetometry, and operando synchrotron X-ray diffraction establish that voltage-induced P ® BM transformations are possible at essentially all x, including x £ 0.50, where both P and BM phases are highly stable. Under small compressive strain the transformation threshold voltage decreases from approximately +2.7 V at x = 0 to negligible at x = 0.70. Both larger compressive strain and tensile strain induce further threshold voltage lowering, particularly at low x. The P ® BM threshold voltage is thus tunable, via both composition and strain. At x = 0.50, voltage-controlled ferromagnetism, transport, and optical transmittance are then demonstrated, achieving Curie temperature and resistivity modulations of ~220 K and at least five orders of magnitude, respectively, and enabling estimation of the voltage-dependent Co valence. The results are analyzed in the context of doping- and strain-dependent oxygen vacancy formation energies and diffusion coefficients, establishing that it is thermodynamic factors, not kinetics, that underpin the decrease of the threshold voltage with x, i.e., with increasing formal Co valence. These findings substantially advance the practical and mechanistic understanding of this voltage-driven transformation, with fundamental and technological implications. -------------------------- SHARING/ACCESS INFORMATION -------------------------- 1. Licenses/restrictions placed on the data: Standard ACS license 2. Links to publications that cite or use the data:https://doi.org/10.1021/acsami.1c13828 3. Was data derived from another source? NO If yes, list source(s): 4. Terms of Use: Data Repository for the U of Minnesota (DRUM) By using these files, users agree to the Terms of Use. https://conservancy.umn.edu/pages/drum/policies/#terms-of-use --------------------- DATA & FILE OVERVIEW --------------------- 1. File List A. Filename: Main TEXT Short description: B. Filename: Short description: C. Filename: Short description: 2. Relationship between files: -------------------------- METHODOLOGICAL INFORMATION -------------------------- 1. Description of methods used for collection/generation of data: 2. Methods for processing the data: 3. Instrument- or software-specific information needed to interpret the data: 4. Standards and calibration information, if appropriate: 5. Environmental/experimental conditions: 6. Describe any quality-assurance procedures performed on the data: 7. People involved with sample collection, processing, analysis and/or submission: ----------------------------------------- DATA-SPECIFIC INFORMATION FOR: [FILENAME] ----------------------------------------- 1. Number of variables: 2. Number of cases/rows: 3. Missing data codes: Code/symbol Definition Code/symbol Definition 4. Variable List Example. Name: Gender Description: Gender of respondent 1 = Male 2 = Female 3 = Other A. Name: Description: Value labels if appropriate B. Name: Description: Value labels if appropriate