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

Haowei He, A. X. Gray, P. Granitzka, J. W. Jeong, N. P. Aetukuri, R. Kukreja, Lin Miao, S. Alexander Breitweiser, Jinpeng Wu, Y. B. Huang, P. Olalde-Velasco, J. Pelliciari, W. F. Schlotter, E. Arenholz, T. Schmitt, M. G. Samant, S. S.P. Parkin, H. A. Dürr, L. Andrew Wray

    Research output: Contribution to journalArticle

    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.

    Original languageEnglish (US)
    Article number161119
    JournalPhysical Review B
    Volume94
    Issue number16
    DOIs
    StatePublished - Oct 21 2016

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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    He, H., Gray, A. X., Granitzka, P., Jeong, J. W., Aetukuri, N. P., Kukreja, R., Miao, L., Breitweiser, S. A., Wu, J., Huang, Y. B., Olalde-Velasco, P., Pelliciari, J., Schlotter, W. F., Arenholz, E., Schmitt, T., Samant, M. G., Parkin, S. S. P., Dürr, H. A., & Wray, L. A. (2016). Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering. Physical Review B, 94(16), [161119]. https://doi.org/10.1103/PhysRevB.94.161119