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Open Access Publications from the University of California

Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering

  • Author(s): He, H
  • Gray, AX
  • Granitzka, P
  • Jeong, JW
  • Aetukuri, NP
  • Kukreja, R
  • Miao, L
  • Breitweiser, SA
  • Wu, J
  • Huang, YB
  • Olalde-Velasco, P
  • Pelliciari, J
  • Schlotter, WF
  • Arenholz, E
  • Schmitt, T
  • Samant, MG
  • Parkin, SSP
  • Dürr, HA
  • Wray, LA
  • et al.

© 2016 American Physical Society. Vanadium dioxide is of broad interest as a spin-12 electron system that realizes a metal-insulator transition near room temperature, due to a combination of strongly correlated and itinerant electron physics. Here, resonant inelastic x-ray scattering is used to measure the excitation spectrum of charge and spin degrees of freedom at the vanadium L edge under different polarization and temperature conditions, revealing excitations that differ greatly from those seen in optical measurements. These spectra encode the evolution of short-range energetics across the metal-insulator transition, including the low-temperature appearance of a strong candidate for the singlet-triplet excitation of a vanadium dimer.

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