Charge disproportionate antiferromagnetism at the verge of the insulator-metal transition in doped LaFeO3Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, India.
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, India.
Department of Engineering Sciences, Uppsala University, Uppsala, Sweden.
Department of Engineering Sciences, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
CSRRI & Department of Physics, Illinois Institute of Technology, Chicago Illinois, USA.
Department of Engineering Sciences, Uppsala University, Uppsala, Sweden.
Department of Engineering Sciences, Uppsala University, Uppsala, Sweden.
Centre de Physique Théorique, Ecole Polytechnique, CNRS UMR 7644, Université Paris-Saclay, Palaiseau, France; Collège de France, Paris, France.
Örebro universitet, Institutionen för naturvetenskap och teknik. Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru, India.
Vise andre og tillknytning
2019 (engelsk)Inngår i: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, nr 7, artikkel-id 075106Artikkel i tidsskrift (Fagfellevurdert) 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.
sted, utgiver, år, opplag, sider
American Physical Society, 2019. Vol. 99, nr 7, artikkel-id 075106
HSV kategori
Identifikatorer
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
Forskningsfinansiär
Swedish Research Council, 2016-4524Knut and Alice Wallenberg Foundation, 2012.0031Swedish Energy Agency, P43294-1Swedish Foundation for Strategic Research
Merknad
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
2019-02-252019-02-252019-02-25bibliografisk kontrollert