Light scattering by V4O7 film across the metal–insulator transition

Bartenev, Alexander; Verbel, Camilo; Camino, Fernando T.; Rua, Armando; Lysenko, Sergiy

doi:10.1063/5.0223230

Title: Light scattering by V₄O₇ film across the metal–insulator transition

Journal Article · 26 September 2024 · Journal of Applied Physics

DOI: https://doi.org/10.1063/5.0223230 · OSTI ID:2477957

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Univ. of Puerto Rico, Mayaguez (Puerto Rico)
Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)

The experimental study of the angle-resolved hemispherical light scattering by V₄O₇ film within a broad temperature range across metal–insulator transition reveals complex structural reorganization of the film deposited on the c-cut sapphire crystal. The bidirectional scattering distribution function and the surface autocorrelation function were obtained from scattering data to visualize statistics of the spatially resolved contributions of optical inhomogeneities in normal and lateral directions to the surface. The measurements reveal an anisotropic surface roughness distribution due to the twinned domain structure, with significant anisotropy changes across the phase transition. The V₄O₇ film deposited on sapphire leads to a polydomain structure, minimizing elastic strain energy with distinct multiscale distributions of surface domains. Near T_c, the material shows the lowest roughness but the highest lateral disorder of the surface.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: SC0012704

OSTI ID:: 2477957

Report Number(s):: BNL--226356-2024-JAAM

Journal Information:: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 12 Vol. 136; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
Bidirectional scatter distribution functions
Electrical conductivity
Light scattering
Materials analysis
Optical metrology
Optical scattering
Phase transitions
Scatterometry
Surface physics

Title: Light scattering by V4O7 film across the metal–insulator transition

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Title: Light scattering by V₄O₇ film across the metal–insulator transition