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Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering
He, H Gray, AX Granitzka, P Jeong, JW Aetukuri, NP Kukreja, R Miao, L Breitweiser, SA Wu, J Huang, YB
He, H
Gray, AX
Granitzka, P
Jeong, JW
Aetukuri, NP
Kukreja, R
Miao, L
Breitweiser, SA
Wu, J
Huang, YB
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Pre-print
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2016-10-21
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10.1103/PhysRevB.94.161119
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© 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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Physical Review B
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