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Charge disproportionate antiferromagnetism at the verge of the insulator-metal transition in doped LaFeO3
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden; Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, India.
Centre de Physique Théorique, Ecole Polytechnique, CNRS UMR 7644, Université Paris-Saclay, Palaiseau, France; Department of Physics, Bennett University, Uttar Pradesh, India.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, 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
American Physical Society, 2019. Vol. 99, no 7, article id 075106
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:oru:diva-72761DOI: 10.1103/PhysRevB.99.075106ISI: 000458168300001Scopus ID: 2-s2.0-85061396881OAI: oai:DiVA.org:oru-72761DiVA, id: diva2:1291415
Funder
Swedish Research Council, 2016-4524Knut and Alice Wallenberg Foundation, 2012.0031Swedish Energy Agency, P43294-1Swedish Foundation for Strategic Research
Note

Funding Agencies:

Tryggers Foundation  CTS-17:376 

Department of Science and Technology, Government of India  

Consolidator Grant of the European Research Council CorrelMat-617196 

IDRIS/GENCI Orsay  t2018091393 

SERB, India  

VR starting Grant from the Swedish Research Council  2016-03278 

eSSENCE  

STandUpp  

Jamsetji Tata Trust 

Available from: 2019-02-25 Created: 2019-02-25 Last updated: 2019-02-25Bibliographically approved

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Eriksson, Olle

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