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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.

Published Web Location

https://doi.org/10.1103/PhysRevB.94.161119
Abstract

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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