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- W2912130430 abstract "We explore the effects of electron doping in lanthanum ferrite, ${mathrm{LaFeO}}_{3}$ by doping Mo at the Fe sites. Based on magnetic, transport, scanning tunneling spectroscopy, and x-ray photoelectron spectroscopy measurements, we find that the large gap, charge-transfer, antiferromagnetic (AFM) insulator ${mathrm{LaFeO}}_{3}$ becomes a small gap AFM band insulator at low Mo doping. With increasing doping concentration, Mo states, which appear around the Fermi level, is broadened and become gapless at a critical doping of 20%. Using a combination of calculations based on density functional theory plus Hubbard $U$ (DFT+U) and x-ray absorption spectroscopy measurements, we find that the system shows charge disproportionation (CD) in Fe ions at 25% Mo doping, where two distinct Fe sites, having ${mathrm{Fe}}^{2+}$ and ${mathrm{Fe}}^{3+}$ nominal charge states appear. A local breathing-type lattice distortion induces the charge disproportionation at the Fe site without destroying the antiferromagnetic order. Our combined experimental and theoretical investigations establish that the Fe states form a CD antiferromagnet at 25% Mo doping, which remains insulating, while the appearance of Mo states around the Fermi level is showing an indication towards the insulator-metal transition." @default.
- W2912130430 created "2019-02-21" @default.
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- W2912130430 date "2019-02-05" @default.
- W2912130430 modified "2023-10-18" @default.
- W2912130430 title "Charge disproportionate antiferromagnetism at the verge of the insulator-metal transition in doped <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi>LaFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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- W2912130430 doi "https://doi.org/10.1103/physrevb.99.075106" @default.
- W2912130430 hasPublicationYear "2019" @default.
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