APS Logo

Topotactic Transformations in Cobaltite Thin Films

ORAL

Abstract

The development of next generation memory, logic, and energy conversion devices motivates the search for materials where their physical properties can be controlled through the migration of charged ions. Among the candidate materials, perovskite oxides ABO3 have received considerable interests because of their multitude of related phases such as the Grenier (ABO2.7), brownmillerite (BM, ABO2.5), square planar (ABO2), and Ruddlesden-Popper (RP, An+1BnO3n+1 where n = integer) phases. In this work, a series of topotactic transformations between these perovskite-related phases has been observed in La0.7Sr0.3CoO3-d thin films upon annealing under highly reducing conditions. At intermediate annealing conditions, a composite phase consisting of ferromagnetic Co nanoparticles embedded in a RP matrix was observed. We show that each structure possesses its own distinct set of physical properties including ferromagnetic/metallic, anti-ferromagnetic/insulating, and ferromagnetic/insulating phases. These results highlight the potential for harnessing these topotactic transformations in next-generation spintronic, neuromorphic, and energy conversion devices based on the movement of oxygen anions.

–

Presenters

  • I-Ting Chiu

    Chemical Engineering, University of California, Davis

Authors

  • I-Ting Chiu

    Chemical Engineering, University of California, Davis

  • Minhan Lee

    Materials Science and Engineering Program, University of California, San Diego, Department of Physics, University of California, San Diego, University of California, San Diego, Department of Physics, University of California San Diego

  • Shaobo Cheng

    Canadian Centre for Electron Microscopy and Department of Materials Science and Engineering, McMaster University, Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Brookhaven National Laboratory

  • Zhen Zhang

    School of Materials Engineering, Purdue University, West Lafayette, IN 47907, School of Materials Engineering, Purdue University

  • Shenli Zhang

    Pritzker School of Molecular Engineering, The University of Chicago

  • Pavel Lapa

    Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, Department of Physics, University of California, San Diego, Materials Science Division, Argonne National Laboratory

  • Larry Heki

    Department of Electrical and Computer Engineering, University of California, Santa Barbara

  • Mingzhen Feng

    Department of Materials Science and Engineering, University of California, Davis

  • Padraic Shafer

    Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory

  • Alpha N'Diaye

    Advanced Light Source, Lawrence Berkeley National Laboratory, Advanced Light Source, Lawrence Berkeley National Laboratory, Lawrence Berkeley Laboratory, E O Lawrence Berkeley National Laboratory, Berkeley, CA, US, academic/govt, Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA

  • Apurva Mehta

    Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Stanford Synchrotron Radiation Lightsource, Menlo Park, CA, US, academic/physics, Stanford Synchrotron Radiation Lightsource

  • Jon Schuller

    Department of Electrical and Computer Engineering, University of California, Santa Barbara

  • Giulia Galli

    The University of Chicago, Pritzker School of Molecular Engineering, The University of Chicago, Pritzker School of Molecular Engineering, University of Chicago, University of Chicago, Department of Chemistry, University of Chicago, Materials Science Division and Center for Molecular Engineering, Argonne National Laboratory

  • Shriram Ramanathan

    School of Materials Engineering, Purdue University, West Lafayette, IN 47907, School of Materials Engineering, Purdue University, Materials engineering, Purdue University

  • Yimei Zhu

    Brookhaven National Laboratory, Condensed Matter Physics and Materials Science Division, Brookhaven National Laboratory, Condensed Matter Physics & Materials Science Department, Brookhaven National Lab, Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Condensed Matter Physics, Brookhaven National Laboratory

  • Ivan K Schuller

    Department of Physics and Center for Advanced Nanoscience, University of California, San Diego, Department of Physics, University of California San Diego

  • Yayoi Takamura

    Department of Materials Science and Engineering, University of California, Davis, University of California, Davis