Anomalous T-dependence of phonon lifetimes in metallic VO2

We investigate phonon lifetimes in VO2 single crystals. We do so in the metallic state above the metal-insulator transition (MIT), where strong structural fluctuations are known to take place. By combining inelastic X-ray scattering and Raman spectroscopy, we track the temperature dependence of seve...

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Published inarXiv.org
Main Authors Rischau, Carl Willem, Korshunov, Artem, Multian, Volodymyr, Lopez-Paz, Sara A, Huang, Chubin, Varbaro, Lucia, Teyssier, Jérémie, Kalcheim, Yoav, Gariglio, Stefano, Bossak, Alexei, Triscone, Jean-Marc, Javier del Valle
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.10.2023
Subjects
Inelastic scattering
Insulators
Metal-insulator transition
Phonons
Raman spectroscopy
Single crystals
Temperature dependence
Vanadium oxides
X-ray scattering
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Summary:We investigate phonon lifetimes in VO2 single crystals. We do so in the metallic state above the metal-insulator transition (MIT), where strong structural fluctuations are known to take place. By combining inelastic X-ray scattering and Raman spectroscopy, we track the temperature dependence of several acoustic and optical phonon modes up to 1000 K. Contrary to what is commonly observed, we find that phonon lifetimes decrease with decreasing temperature. Our results show that pre-transitional fluctuations in the metallic state give rise to strong electron-phonon scattering that onsets hundreds of degrees above the transition and increases as the MIT is approached. Notably, this effect is not limited to specific points of reciprocal space that could be associated with the structural transition.
ISSN:2331-8422