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Charge disproportionate antiferromagnetism at the verge of the insulator-metal transition in doped LaFeO3
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics. Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India;Helmholtz Zentrum Berlin FG ISRR, Albert Einstein Str 15, D-12489 Berlin, Germany.
Univ Paris Saclay, Ctr Phys Theor, Ecole Polytech, CNRS UMR 7644, F-91128 Palaiseau, France;Bennett Univ, Dept Phys, Greater Noida 201310, Uttar Pradesh, India.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.ORCID iD: 0000-0003-0351-3138
Indian Inst Sci, Solid State & Struct Chem Unit, Bengaluru 560012, India.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 7, article id 075106Article in journal (Refereed) Published
Abstract [en]

We explore the effects of electron doping in lanthanum ferrite, LaFeO3 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 LaFeO3 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 Fe2+ and Fe3+ 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.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 7, article id 075106
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-378537DOI: 10.1103/PhysRevB.99.075106ISI: 000458168300001OAI: oai:DiVA.org:uu-378537DiVA, id: diva2:1297951
Funder
Swedish Research Council, 2016-4524Knut and Alice Wallenberg Foundation, 2012.0031Swedish Energy Agency, P43294-1EU, European Research Council, CorrelMat-617196Swedish Research Council, 2016-03278Swedish Research CouncilSwedish Foundation for Strategic Research Carl Tryggers foundation , CTS-17:376eSSENCE - An eScience CollaborationStandUpAvailable from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-03-21Bibliographically approved

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Jana, SomnathPhuyal, DibyaMukherjee, SohamAnil Kumar, PuriHedlund, DanielSchött, JohanThunström, PatrikKvashnin, YaroslavRensmo, HåkanKamalakar, M. VenkataSvedlindh, PeterGunnarsson, KlasEriksson, OlleKaris, Olof

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Jana, SomnathPhuyal, DibyaMukherjee, SohamAnil Kumar, PuriHedlund, DanielSchött, JohanThunström, PatrikKvashnin, YaroslavRensmo, HåkanKamalakar, M. VenkataSvedlindh, PeterGunnarsson, KlasEriksson, OlleKaris, Olof
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Molecular and Condensed Matter PhysicsSolid State PhysicsMaterials Theory
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