X-ray nanodiffraction studies of ionically controlled nanoscale phase separation in cobaltites

Rippy, Geoffery; Trinh, Lacey; Kane, Alexander M.; Ionin, Aleksey L.; Lee, Michael S.; Chopdekar, Rajesh V.; Christiansen-Salameh, Joyce M.; Gilbert, Dustin A.; Grutter, Alenxander J.; Murray, Peyton D.; Holt, Martin V.; Cai, Zhonghou; Liu, Kai; Takamura, Yayoi; Kukreja, Roopali

doi:10.1103/PhysRevMaterials.3.082001

Title: X-ray nanodiffraction studies of ionically controlled nanoscale phase separation in cobaltites

Journal Article · Mon Aug 05 00:00:00 EDT 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.082001· OSTI ID:1562285

Rippy, Geoffery ^[1]; Trinh, Lacey ^[1]; Kane, Alexander M. ^[1]; Ionin, Aleksey L. ^[1]; Lee, Michael S. ^[1]; Chopdekar, Rajesh V. ^[1]; Christiansen-Salameh, Joyce M. ^[1]; Gilbert, Dustin A. ^[2]; Grutter, Alenxander J. ^[3]; Murray, Peyton D. ^[4]; Holt, Martin V. ^[5]; Cai, Zhonghou ^[6]; Liu, Kai ^[7]; Takamura, Yayoi ^[1]; Kukreja, Roopali ^[1]

Univ. of California Davis, Davis, CA (United States). Dept. of Materials Science and Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). NIST Center for Neutron Research
Univ. of California Davis, Davis, CA (United States). Dept. of Physics
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Proton Source
Univ. of California Davis, Davis, CA (United States). Dept. of Physics; Georgetown Univ., Washington, D.C. (United States). Dept. of Physics

© 2019 American Physical Society. Complex oxide heterostructures provide access to emergent functional and structural phases which are not present in the bulk constituent materials. In this Rapid Communication, we focus on La0.67Sr0.33CoO3 (LSCO)/Gd heterostructures due to the high oxygen ion conductivity, as well as the coupled magnetic and electronic properties of LSCO, which are strongly dependent on the oxygen stoichiometry. This combination of properties enables the ionic control of the functional properties of LSCO thin films through the presence of oxygen getter layers such as Gd. We utilize X-ray nanodiffraction to directly image the nanoscale morphology of LSCO thin films as they are progressively transformed from the equilibrium perovskite phase to the metastable brownmillerite (BM) phase with increasing Gd thickness. Our studies show the coexistence of perovskite and BM phases with a critical oxygen vacancy concentration threshold which leads to the formation of extended BM filaments. In addition to lateral phase separation, we observed phase separation within the film thickness possibly due to pinning of the perovskite and BM phases by the substrate/LSCO and LSCO/Gd interface, respectively. Our studies provide a nanoscale survey of the phase separation in the cobaltites and shed light on the formation of the metastable BM phase.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); University of California–Davis, Davis, CA (United States); National Science Foundation (NSF); University of California, Davis

Grant/Contract Number:: AC02-06CH11357; AC02-05CH11231

OSTI ID:: 1562285

Alternate ID(s):: OSTI ID: 1547991; OSTI ID: 1573808; OSTI ID: 1581604

Journal Information:: Physical Review Materials, Vol. 3, Issue 8; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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