Switchable orbital polarization and magnetization in strained LaCoO3 films

Guo, Er-Jia; Desautels, Ryan D.; Keavney, David; Herklotz, Andreas; Ward, T. Zac; Fitzsimmons, Michael R.; Lee, Ho Nyung

doi:10.1103/PhysRevMaterials.3.014407

Title: Switchable orbital polarization and magnetization in strained $LaCo O_{3}$ films

Journal Article · Tue Jan 15 00:00:00 EST 2019 · Physical Review Materials

DOI:https://doi.org/10.1103/PhysRevMaterials.3.014407· OSTI ID:1505601

Guo, Er-Jia ^[1]; Desautels, Ryan D. ^[2]; Keavney, David ^[3]; Herklotz, Andreas ^[4]; Ward, T. Zac ^[2]; Fitzsimmons, Michael R. ^[5]; Lee, Ho Nyung ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Chinese Academy of Sciences (CAS), Beijing (China); Univ. of Chinese Academy of Sciences, Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Lemont, IL (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Martin Luther Univ. of Halle-Wittenberg (MLU), Halle (Germany)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Strain engineering of epitaxial heterostructures offers opportunities to control the orbital degree of freedom by lifting the degeneracy of e_g states. In this work, we show that the orbital occupation in LaCoO₃ (LCO) films can be switched between two degenerate e_g bands with epitaxial strain. The orbital polarization of nearly -100% (or 100%) is controlled by depleting occupation of the d_x2-y2 (or d(_3z2-r2) orbital entirely in LCO for large compressive (or moderate tensile) strain. The change of electronic configuration associated with the spin-state transition modulates the magnetization of strained LCO films. Under compressive strain, LCO films exhibit a small magnetization without long-range ferromagnetic ordering. With tensile-strain increases, the magnetization of LCO films increases and reaches the maximum value when the bonding angle (Co-O-Co) is close to 180° and the in-plane bond length (Co-O) is unstretched. Our results highlight the role of octahedral distortion and spin-state crossover in tailoring the magnetic properties of cobaltite thin films, indicating an attractive route to deliberately control the orbital polarization that can be tuned to maximize the functionality of oxide heterostructures.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC02-06CH1135; AC05-00OR22725

OSTI ID:: 1505601

Alternate ID(s):: OSTI ID: 1490921; OSTI ID: 1607130

Journal Information:: Physical Review Materials, Vol. 3, Issue 1; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Maximization of ferromagnetism in $LaCo O_{3}$ films by competing symmetry Li, Sisi; Wang, Jiesu; Zhang, Qinghua Physical Review Materials, Vol. 3, Issue 11 https://doi.org/10.1103/physrevmaterials.3.114409	journal	November 2019

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Title: Switchable orbital polarization and magnetization in strained $LaCo O_{3}$ films