Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering
/ Authors
Haowei He, Alexander Gray, Alexander Gray, P. Granitzka, P. Granitzka, Jaewoo Jeong, N. Aetukuri, R. Kukreja, Lin Miao, Lin Miao
and 12 more authors
S. Breitweiser, Jinpeng Wu, Y. Huang, P. Olalde-Velasco, J. Pelliciari, W. Schlotter, E. Arenholz, Thorsten Schmitt, M. Samant, S. Parkin, H. A. Dürr, L. Wray
/ Abstract
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; Durr, HA; Wray, LA | Abstract: © 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.
Journal: Physical Review B