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1.
  • Martinelli, L., et al. (author)
  • Collective Nature of Orbital Excitations in Layered Cuprates in the Absence of Apical Oxygens
  • 2024
  • In: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 132:6
  • Journal article (peer-reviewed)abstract
    • We have investigated the 3d orbital excitations in CaCuO2 (CCO), Nd2CuO4 (NCO), and La2CuO4 (LCO) using high-resolution resonant inelastic x-ray scattering. In LCO they behave as well-localized excitations, similarly to several other cuprates. On the contrary, in CCO and NCO the dxy orbital clearly disperses, pointing to a collective character of this excitation (orbiton) in compounds without apical oxygen. We ascribe the origin of the dispersion as stemming from a substantial next-nearest-neighbor (NNN) orbital superexchange. Such an exchange leads to the liberation of the orbiton from its coupling to magnons, which is associated with the orbiton hopping between nearest neighbor copper sites. Finally, we show that the exceptionally large NNN orbital superexchange can be traced back to the absence of apical oxygens suppressing the charge transfer energy.
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2.
  • Parchenko, Sergii, et al. (author)
  • Orbital dynamics during an ultrafast insulator to metal transition
  • 2020
  • In: Physical Review Research. - : AMER PHYSICAL SOC. - 2643-1564. ; 2:2
  • Journal article (peer-reviewed)abstract
    • We present ultrafast resonant inelastic x-ray scattering (RIXS) experiments performed at the vanadium L edge to track changes in the electronic structure of V2O3, a classical Mott-Hubbard material. The probed orbital excitations within the d shell of the V ion show a sub-ps time response, which evolves at later times to a state that appears electronically indistinguishable from the high-temperature metallic state. For low excitation fluences, a transient recovery or delay is observed, which could be related to a transient dimerization of the V-V bonds. Our results demonstrate the great potential for RIXS spectroscopy to study the ultrafast orbital dynamics in strongly correlated materials.
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