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.94.161119Abstract
© 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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