Evidence for the constancy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>U</mml:mi></mml:math>in the Mott transition of V<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub></mml:math>O<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub></mml:math>

Fujiwara, H.; Sekiyama, A.; Mo, S.-K.; Allen, J. W.; Yamaguchi, Junichi; Funabashi, G.; Imada, S.; Metcalf, P.; Higashiya, A.; Yabashi, Makina; Tamasaku, Kenji; Ishikawa, Tetsuya; Suga, Sei–ichiro

doi:10.1103/physrevb.84.075117

Cited by 27 publications

(17 citation statements)

References 37 publications

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“…Of interest is the spectral weight transfer between metallic and insulator phases within the energy range of 2 eV from E F . This spectral weight transfer across MIT is not only observed in manganese oxides but also in other strongly correlated oxides like V 2 O 3 [8]. MIT is also found in the Mn 2p core level spectra as shown in Fig.…”

Section: Resultsmentioning

confidence: 55%

“…It is reported that the magnetism and the orbital structure at the surface of La 2−2x Sr 1+2x Mn 2 O 7 are different from the bulk states [6,7]. Since the photoemission spectroscopy at various photon energies (hν) is very powerful to reveal the difference between the surface and the bulk electronic structures [8], we have performed the soft-and hard-x-ray photoemission of La 2−2x Sr 1+2x Mn 2 O 7 (x = 0.38, 0.40).…”

Section: Introductionmentioning

confidence: 99%

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Soft- and Hard-X-ray Photoemission Spectroscopy of La_2-2xSr_1+2xMn₂O₇

et al. 2012

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We have performed the photoemission spectroscopy of the bilayered manganese oxides La 2−2x Sr 1+2x Mn 2 O 7 (x = 0.38, 0.40) with the photon energies (hν) of 640-700 eV and 8150 eV. The difference between the surface and the bulk electronic structures is revealed from the polar-angle dependence of the Sr 3d core level and the valence band spectra with hν = 700 eV. Moreover, we have reconfirmed that the spectral weight at the Fermi level is suppressed even in the bulk electronic states by means of the valence band spectra obtained by the Mn 2p-3d resonant photoemission with hν ∼ 643eV and by the hard-X-ray photoemission spectroscopy with 8175eV photons.

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Section: Resultsmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Soft- and Hard-X-ray Photoemission Spectroscopy of La_2-2xSr_1+2xMn₂O₇

et al. 2012

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“…Our observation of a drastic change in the X-ray Raman spectra thereby implies an accompanying change in metallicity and electron correlation effects across the structure transition. On the other hand, while a strong ad hoc reduction in the interactions parameters could lead to a smaller multiplet energy spread, the interaction and local ligand hybridization parameters are not expected to differ substantially even across a metal-insulator-transition [45]. Therefore, the observed phenomenon requires further explanation.…”

Section: (B) and 3(c))mentioning

confidence: 98%

Novel High-Pressure Monoclinic Metallic Phase ofV2O3

et al. 2014

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Vanadium sesquioxide, V 2 O 3, is a prototypical metal-to-insulator system where, in temperaturedependent studies, the transition always coincides with a corundum-to-monoclinic structural transition. As a function of pressure, V 2 O 3 follows the expected behavior of increased metallicity due to a larger bandwidth for pressures up to 12.5 GPa. Surprisingly, for higher pressures when the structure becomes unstable, the resistance starts to increase. Around 32.5 GPa at 300 K, we observe a novel pressure-induced corundum-to-monoclinic transition between two metallic phases, showing that the structural phase transition can be decoupled from the metal-insulator transition. Using X-ray Raman scattering, we find that screening effects, which are strong in the corundum phase, become weakened at high pressures. Theoretical calculations indicate that this can be related to a decrease in coherent quasiparticle strength, suggesting that the highpressure phase is likely a critical correlated metal, on the verge of Mott-insulating behavior.

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“…A calculation of k-resolved QP bands for comparison to our data would be required to more fully evaluate this line of study. Recent hard x-ray photoemission and absorption experiments have provided additional MIT model constraints on the variation of U between the metal and insulating phases [34] and on the different variation of the orbital occupancies for the pressure-induced PI phase [35] as compared to the Cr-doping and temperature induced PI phases. Thus the mystery of the MIT lives on.…”

Section: +mentioning

confidence: 99%

Fermi Surface of MetallicV2O3from Angle-Resolved Photoemission: Mid-level Filling of
Vecchio
¹
,
Denlinger
²
,
Krupin
³

et al. 2016
Phys. Rev. Lett.

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Using angle resolved photoemission spectroscopy (ARPES) we report the first band dispersions and distinct features of the bulk Fermi surface (FS) in the paramagnetic metallic phase of the prototypical metal-insulator transition material V2O3. Along the c-axis we observe both an electron pocket and a triangular hole-like FS topology, showing that both V 3d a1g and e π g states contribute to the FS. These results challenge the existing correlation-enhanced crystal field splitting theoretical explanation for the transition mechanism and pave the way for the solution of this mystery.PACS numbers: 79.60.-i,71.27.+a,71.30.+h Since its seminal report in 1969 [1][2][3], the metalinsulator transition (MIT) in the alloy system (V 1−x Cr x ) 2 O 3 has stood as a mystery for many decades. For x=0 and with decreasing temperature (T ) there is a transition from a paramagnetic metal (PM) to an antiferromagnetic insulator (AFI). With increasing x the AFI phase persists but the PM phase gives way to a paramagnetic insulator (PI) along an (x, T ) line terminating at higher T in a critical point. The initial identification of the latter transition as the long sought experimental example of the Mott MIT [4] inherent in the one-band Hubbard model was quickly challenged [5] on the grounds that the complexity of the actual multi-orbital electronic structure must be essential for the transition. This complexity consists of four V 3+ions per rhombohedral unit cell with each ion having two 3d electrons to distribute in the two lowest energy trigonal crystal field split 3d states, an orbital singlet a 1g and an orbital doublet e π g . Scenarios for reducing this complexity back to a one-band model [6] were eventually abandoned after X-ray absorption spectroscopy (XAS) showed that the V 3+ ions are in a Hund's rule S=1 state and that both the e π g and a 1g states are always occupied, albeit with different occupation ratios e/a(=e π g :a 1g ) in the three phases [7].The advent of dynamic mean field theory (DMFT) [8] combined [9] with band structure from density functional theory (DFT), supported by bulk sensitive angle integrated photoemission spectra for (V 1−x Cr x ) 2 O 3 [10, 11], gave the first real hope that the mystery could be solved within a realistic multi-orbital calculation. Indeed a series of DFT+ DMFT studies in the first decade of this century [12][13][14] gradually coalesced around a narrative in which the MIT is enabled by a strong many-body enhancement of the trigonal crystal field splitting and thus the orbital polarization of the quasi-particle (QP) bands based on the e π g and a 1g states. In 2007 the claim in Ref. [14] "to have demystified the nature of the metalinsulator transition in V 2 O 3 " seemed well justified by the consensus. The study suggested that in the PM phase the Fermi surface (FS) is formed entirely from an a 1g QP band, while all the e π g QP bands lie entirely below the Fermi energy, E F , a scenario consistent with electron counting only by virtue of QP weights sufficiently reduced from...

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Evidence for the constancy ofUin the Mott transition of V2O3

Cited by 27 publications

References 37 publications

Soft- and Hard-X-ray Photoemission Spectroscopy of La_2-2xSr_1+2xMn₂O₇

Soft- and Hard-X-ray Photoemission Spectroscopy of La_2-2xSr_1+2xMn₂O₇

Novel High-Pressure Monoclinic Metallic Phase ofV2O3

Fermi Surface of MetallicV2O3from Angle-Resolved Photoemission: Mid-level Filling of
Vecchio
¹
,
Denlinger
²
,
Krupin
³

et al. 2016
Phys. Rev. Lett.

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Evidence for the constancy ofUin the Mott transition of V2O3

Cited by 27 publications

References 37 publications

Soft- and Hard-X-ray Photoemission Spectroscopy of La2-2xSr1+2xMn2O7

Soft- and Hard-X-ray Photoemission Spectroscopy of La2-2xSr1+2xMn2O7

Novel High-Pressure Monoclinic Metallic Phase ofV2O3

Fermi Surface of MetallicV2O3from Angle-Resolved Photoemission: Mid-level Filling ofVecchio1, Denlinger2, Krupin3 et al. 2016Phys. Rev. Lett.

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Soft- and Hard-X-ray Photoemission Spectroscopy of La_2-2xSr_1+2xMn₂O₇

Soft- and Hard-X-ray Photoemission Spectroscopy of La_2-2xSr_1+2xMn₂O₇

Fermi Surface of MetallicV2O3from Angle-Resolved Photoemission: Mid-level Filling of
Vecchio
¹
,
Denlinger
²
,
Krupin
³

et al. 2016
Phys. Rev. Lett.