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  The Role of Phonons and Oxygen Vacancies in Non-Cubic SrVO3

Berry, T., Fry-Petit, A. M., Sinha, M., Zhang, Q., Auffermann, G., McQueen, T. M., et al. (2022). The Role of Phonons and Oxygen Vacancies in Non-Cubic SrVO3. Inorganic Chemistry, 61, 3007-3017. doi:10.1021/acs.inorgchem.1c03201.

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 Creators:
Berry, Tanya1, Author
Fry-Petit, Allyson Marie1, Author
Sinha, Mekhola1, Author
Zhang, Qiang1, Author
Auffermann, Gudrun2, Author           
McQueen, Tyrel M.1, Author
Rudin, Sven P.1, Author
Phelan, W. Adam1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Gudrun Auffermann, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863432              

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 Abstract: Combining neutron diffraction with pair distribution function analysis, we have uncovered hidden reduced symmetry in the correlated metallic d1 perovskite, SrVO3. Specifically, we show that both the local and global structures are better described using a GdFeO3 distorted (orthorhombic) model as opposed to the ideal cubic ABO3 perovskite type. Recent reports of imaginary phonon frequencies in the density functional theory (DFT)-calculated phonon dispersion for cubic SrVO3 suggest a possible origin of this observed non-cubicity. Namely, the imaginary frequencies computed could indicate that the cubic crystal structure is unstable at T = 0 K. However, our DFT calculations provide compelling evidence that point defects in the form of oxygen vacancies, and not an observable symmetry breaking associated with calculated imaginary frequencies, primarily result in the observed non-cubicity of SrVO3. These experimental and computational results are broadly impactful because they reach into the thin-film and theoretical communities who have shown that SrVO3 is a technologically viable transparent conducting oxide material and have used SrVO3 to develop theoretical methods, respectively. © 2022 American Chemical Society.

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Language(s): eng - English
 Dates: 2022-02-102022-02-10
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1021/acs.inorgchem.1c03201
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Title: Inorganic Chemistry
  Abbreviation : Inorg. Chem.
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 61 Sequence Number: - Start / End Page: 3007 - 3017 Identifier: ISSN: 0020-1669
CoNE: https://pure.mpg.de/cone/journals/resource/0020-1669