Controlling Magnetism and Transport at Perovskite Cobaltite Interfaces via Strain-Tuned Oxygen Vacancy Ordering

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2011
2024

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2024

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Controlling Magnetism and Transport at Perovskite Cobaltite Interfaces via Strain-Tuned Oxygen Vacancy Ordering

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2025-03-11

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Leighton, Chris
leighton@umn.edu

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Abstract

Complex oxides such as perovskite cobaltites exhibit rich phenomena at interfaces due to the complex interplay between their structural, defect, electronic, and magnetic degrees of freedom. We study this here in the ferromagnetic metallic cobaltite La1-xSrxCoO3-, using specific substrates to systematically vary both the heteroepitaxial strain (compressive vs. tensile) and growth orientation ((001) vs. (110)). Transmission electron microscopy, electron energy-loss spectroscopy, high-resolution X-ray diffraction, magnetometry, polarized neutron reflectometry, and electronic magnetotransport measurements are applied. Lattice mismatch and growth orientation are found to precisely control interfacial oxygen vacancy ordering in La1-xSrxCoO3-, thus dictating strain relaxation and chemical depth profiles, and in turn controlling thickness-dependent magnetic and electronic properties. In particular, compressive strain and (110) orientations are found to minimize deleterious magnetic/electronic dead layer effects, leading to optimization of interfacial magnetism and transport. Strain and orientation tuning of oxygen vacancy ordering are thus established as powerful means to control physical properties at cobaltite-based interfaces, of relevance to several fields.

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Enclosed is the dataset for each main figure in the article "Controlling Magnetism and Transport at Perovskite Cobaltite Interfaces via Strain-Tuned Oxygen Vacancy Ordering". Data includes Scanning transmission electron images, VSM magnetometry, polarized neutron reflectometry data, temperature and field-dependent electronic transport, Derived and extracted parameters from all the figures are also provided. See readme for detailed descriptions.

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This work was primarily supported by the US Department of Energy through the University of Minnesota (UMN) Center for Quantum Materials, under Grant No. DE-SC0016371. Parts of this work were conducted in the University of Minnesota Characterization Facility, which is partially supported by the National Science Foundation through the MRSEC program under DMR-2011401. STEM-EELS measurements were carried out in the former STEM group at Oak Ridge National Laboratory, supported by the US Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division. The UMN authors acknowledge productive and helpful discussions with Javier Garcia Barriocanal.

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Leighton, Chris; Bose, Shameek; Sharma, Manish; Torija, Maria A; Walter, Jeff; Nandakumaran, Nileena; Dewey, John; Schmitt, Josh; Gazquez, Jaume; Varela, Maria; Zhernenkov, Mikhail; Fitzsimmons, Michael R; Ambaye, Haile; Lauter, Valeria; Hovoka, Ondrej; Berger, Andreas. (2025). Controlling Magnetism and Transport at Perovskite Cobaltite Interfaces via Strain-Tuned Oxygen Vacancy Ordering. Retrieved from the Data Repository for the University of Minnesota (DRUM), https://hdl.handle.net/11299/270214.

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