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Interplay Between Electron Correlations, Magnetic State, and Structural Confinement in LaNiO3 Ultrathin Films

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We report a theoretical study of the effects of electron correlations and structural confinement on the electronic properties and magnetic state of LaNiO3 (LNO) thin films epitaxially deposited on the \((001)\) LaAlO3 (LAO) substrate. Using the DFT + U method we compute the electronic band structure, magnetic properties, and phase stability of the 1.5 unit-cell-thick NiO2-terminated LNO thin films. Our results reveal complex diversity of the electronic states caused by the effects of structural confinement, interfacial charge transfer and electronic correlations. Our calculations suggest the appearance of in-plane (110) charge disproportionation of the Ni ions in the interface NiO2 layer of the antiferromagnetically ordered LNO thin films. Moreover, the electronic states of both the antiferromagnetic and ferromagnetic LNO/LAO show a large orbital polarization of the Ni ions in the surface NiO2 layers. Our results suggest the crucial importance of oxygen defects to explain the metal-to-insulator phase transition experimentally observed in a few-unit-cell-thick LNO/LAO thin films.

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Funding

This work was supported by the Russian Science Foundation (project no. 22-22-00926, https://rscf.ru/project/22-22-00926).

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Authors and Affiliations

  1. Institute of Physics and Technology, Ural Federal University, 620002, Yekaterinburg, Russia

    N. O. Vambold & I. V. Leonov

  2. Institute of Natural Sciences and Mathematics, Ural Federal University, 620002, Yekaterinburg, Russia

    G. A. Sazhaev

  3. Mikheev Institute of Metal Physics, Russian Academy of Sciences, 620108, Yekaterinburg, Russia

    I. V. Leonov

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  1. N. O. Vambold
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Vambold, N.O., Sazhaev, G.A. & Leonov, I.V. Interplay Between Electron Correlations, Magnetic State, and Structural Confinement in LaNiO3 Ultrathin Films. Jetp Lett. 118, 886–892 (2023). https://doi.org/10.1134/S0021364023603287

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