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    Surface- and strain-tuning of the optical dielectric function in epitaxially grown CaMnO<inf>3</inf>

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    Genre
    Journal Article
    Date
    2016-02-22
    Author
    Imbrenda, D
    Yang, D
    Wang, H
    Akbashev, AR
    Kasaei, L
    Davidson, BA
    Wu, X
    Xi, X
    Spanier, JE
    Subject
    cond-mat.mtrl-sci
    cond-mat.mtrl-sci
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/5736
    
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    DOI
    10.1063/1.4942374
    Abstract
    © 2016 AIP Publishing LLC. We report a strong thickness dependence of the complex frequency-dependent optical dielectric function ϵ ̃ ( ω ) over a spectral range from 1.24 to 5 eV in epitaxial CaMnO3(001) thin films on SrTiO3(001), LaAlO3(001), and SrLaAlO4(001). A doubling of the peak value of the imaginary part of ϵ ̃ ( ω ) and spectral shifts of 0.5 eV for a given magnitude of absorption are observed. On the basis of experimental analyses and first-principles density functional theory calculations, contributions from both surface states and epitaxial strain to the optical dielectric function of CaMnO3 are seen. Its evolution with thickness from 4 to 63 nm has several regimes. In the thinnest, strain-coherent films, the response is characterized by a significant contribution from the free surface that dominates strain effects. However, at intermediate and larger thicknesses approaching the bulk-like film, strain coherence and partial strain relaxation coexist and influence ϵ ̃ ( ω ).
    Citation to related work
    AIP Publishing
    Has part
    Applied Physics Letters
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    ae974a485f413a2113503eed53cd6c53
    http://dx.doi.org/10.34944/dspace/5718
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