Spacer-layer-tunable ferromagnetic half-metal-ferromagnetic insulator transition in SrVO<sub>3</sub>/SrTiO<sub>3</sub> superlattice
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Published:2022
Issue:23
Volume:71
Page:237301
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ISSN:1000-3290
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Container-title:Acta Physica Sinica
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language:
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Short-container-title:Acta Phys. Sin.
Author:
Fang Xiao-Nan,Wei Qin,Sui Na-Na,Kong Zhi-Yong,Liu Jing,Du Yan-Ling, ,
Abstract
In this work, the first-principle calculations based on density functional theory (DFT) are employed to investigate the electronic and magnetic properties of SrVO<sub>3</sub>/SrTiO<sub>3</sub>(111) superlattices. The studies show that the transition from ferromagnetic half-metal to ferromagnetic insulator can be achieved by adjusting the thickness of the spacer-layer SrTiO<sub>3</sub>. The interlayer coupling between the SrVO<sub>3</sub> sublayers can occur across two unit-cell (uc) distance of SrTiO<sub>3</sub>, and the superlattice is ferromagnetic half-metal. When the SrTiO<sub>3</sub> sublayers are 3uc, a small band gap (about 0.28 eV) appears in the superlattice. When the SrTiO<sub>3</sub> sublayers are more than 3uc, the superlattice has a large band gap and exhibits ferromagnetic insulating state. Further studies show that the Ti-V mixed defects play an important role in realizing the transition of metal-insulator. Compared with the ideal interface, the Ti-V mixed interface can inhibit the interlayer coupling and induce the transition of ferromagnetic half-metal to ferromagnetic insulator. These results provide a theoretical basis for the transition of ferromagnetic half-metal to ferromagnetic insulator by adjusting the number of SrTiO<sub>3</sub> layers in SrVO<sub>3</sub>/SrTiO<sub>3</sub>(111) superlattices.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy
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