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

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

Journal Article · Mon Jan 14 23:00:00 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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Lemont, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1505601

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

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Structural, electronic, transport and magnetic studies of LaCo _1 − x Ni _x O ₃ (x = 0, 0.3) thin films Kumar, Ashok; Kumar, Vinod; Shukla, Dinesh Journal of Applied Physics, Vol. 126, Issue 23 https://doi.org/10.1063/1.5119435	journal	December 2019
Exploiting Symmetry Mismatch to Control Magnetism in a Ferroelastic Heterostructure Guo, Er-Jia; Desautels, Ryan; Lee, Dongkyu Physical Review Letters, Vol. 122, Issue 18 https://doi.org/10.1103/physrevlett.122.187202	journal	May 2019
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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36 MATERIALS SCIENCE
Orbital polarization
X-ray scattering
ferroelastic materials
ferromagnetism
strain engineering