Soft x-ray spectroscopic study of the ferromagnetic insulator V 0.82 Cr0.18 O2

L. F.J. Piper, A. Demasi, S. W. Cho, A. R.H. Preston, J. Laverock, K. E. Smith, K. G. West, J. W. Lu, S. A. Wolf

Research output: Contribution to journalArticle

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Abstract

The chromium-vanadium oxide system V1-x Crx O 2 (0.1<x<0.2) displays both insulating character in the rutile phase and room-temperature ferromagnetism. A combination of x-ray photoemission spectroscopy, resonant inelastic x-ray scattering, and resonant x-ray emission spectroscopy of the V L3,2, OK, and Cr L3,2 edges was used to study the electronic structure near the Fermi level of V0.82 Cr0.12 O2. Our results show that the chromium enters as Cr3⊃+ with the d3 configuration, resulting in the formation of Cr3⊃+ -V5⊃+ ion pairs, in contrast to the simple Cr4⊃+ substitution expected from the end members VO2 and CrO2. The occupied Cr3d orbital is located ∼2 eV below the Fermi level. Comparison with the parent material VO2 reveals significant changes in the O2p bandwidth and increased O2p-V3d hybridization in V0.82 Cr0.12 O 2, which are attributed to the reduced atomic spacing upon doping. Two energy loss features due to d- d⊃ - transitions are observed at 0.95 and 1.75 eV in the V L3 -edge x-ray scattering spectra and are explained in terms of the splitting of the t2g -derived π band.

Original languageEnglish
Article number235103
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number23
DOIs
Publication statusPublished - 2010 Dec 1

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x ray scattering
insulators
X rays
chromium oxides
vanadium oxides
Chromium
Fermi level
rutile
spectroscopy
ferromagnetism
chromium
inelastic scattering
x rays
photoelectric emission
energy dissipation
spacing
Scattering
substitutes
electronic structure
bandwidth

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Piper, L. F.J. ; Demasi, A. ; Cho, S. W. ; Preston, A. R.H. ; Laverock, J. ; Smith, K. E. ; West, K. G. ; Lu, J. W. ; Wolf, S. A. / Soft x-ray spectroscopic study of the ferromagnetic insulator V 0.82 Cr0.18 O2. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 23.
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abstract = "The chromium-vanadium oxide system V1-x Crx O 2 (0.13,2, OK, and Cr L3,2 edges was used to study the electronic structure near the Fermi level of V0.82 Cr0.12 O2. Our results show that the chromium enters as Cr3⊃+ with the d3 configuration, resulting in the formation of Cr3⊃+ -V5⊃+ ion pairs, in contrast to the simple Cr4⊃+ substitution expected from the end members VO2 and CrO2. The occupied Cr3d orbital is located ∼2 eV below the Fermi level. Comparison with the parent material VO2 reveals significant changes in the O2p bandwidth and increased O2p-V3d hybridization in V0.82 Cr0.12 O 2, which are attributed to the reduced atomic spacing upon doping. Two energy loss features due to d- d⊃ - transitions are observed at 0.95 and 1.75 eV in the V L3 -edge x-ray scattering spectra and are explained in terms of the splitting of the t2g -derived π band.",
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Piper, LFJ, Demasi, A, Cho, SW, Preston, ARH, Laverock, J, Smith, KE, West, KG, Lu, JW & Wolf, SA 2010, 'Soft x-ray spectroscopic study of the ferromagnetic insulator V 0.82 Cr0.18 O2', Physical Review B - Condensed Matter and Materials Physics, vol. 82, no. 23, 235103. https://doi.org/10.1103/PhysRevB.82.235103

Soft x-ray spectroscopic study of the ferromagnetic insulator V 0.82 Cr0.18 O2. / Piper, L. F.J.; Demasi, A.; Cho, S. W.; Preston, A. R.H.; Laverock, J.; Smith, K. E.; West, K. G.; Lu, J. W.; Wolf, S. A.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 23, 235103, 01.12.2010.

Research output: Contribution to journalArticle

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AU - Piper, L. F.J.

AU - Demasi, A.

AU - Cho, S. W.

AU - Preston, A. R.H.

AU - Laverock, J.

AU - Smith, K. E.

AU - West, K. G.

AU - Lu, J. W.

AU - Wolf, S. A.

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N2 - The chromium-vanadium oxide system V1-x Crx O 2 (0.13,2, OK, and Cr L3,2 edges was used to study the electronic structure near the Fermi level of V0.82 Cr0.12 O2. Our results show that the chromium enters as Cr3⊃+ with the d3 configuration, resulting in the formation of Cr3⊃+ -V5⊃+ ion pairs, in contrast to the simple Cr4⊃+ substitution expected from the end members VO2 and CrO2. The occupied Cr3d orbital is located ∼2 eV below the Fermi level. Comparison with the parent material VO2 reveals significant changes in the O2p bandwidth and increased O2p-V3d hybridization in V0.82 Cr0.12 O 2, which are attributed to the reduced atomic spacing upon doping. Two energy loss features due to d- d⊃ - transitions are observed at 0.95 and 1.75 eV in the V L3 -edge x-ray scattering spectra and are explained in terms of the splitting of the t2g -derived π band.

AB - The chromium-vanadium oxide system V1-x Crx O 2 (0.13,2, OK, and Cr L3,2 edges was used to study the electronic structure near the Fermi level of V0.82 Cr0.12 O2. Our results show that the chromium enters as Cr3⊃+ with the d3 configuration, resulting in the formation of Cr3⊃+ -V5⊃+ ion pairs, in contrast to the simple Cr4⊃+ substitution expected from the end members VO2 and CrO2. The occupied Cr3d orbital is located ∼2 eV below the Fermi level. Comparison with the parent material VO2 reveals significant changes in the O2p bandwidth and increased O2p-V3d hybridization in V0.82 Cr0.12 O 2, which are attributed to the reduced atomic spacing upon doping. Two energy loss features due to d- d⊃ - transitions are observed at 0.95 and 1.75 eV in the V L3 -edge x-ray scattering spectra and are explained in terms of the splitting of the t2g -derived π band.

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