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Interplay of point defects, biaxial strain, and thermal conductivity in homoepitaxial SrTiO 3 thin films

Wiedigen, S. ; Kramer, T. ; Feuchter, M. ; Knorr, I. ; Nee, N. ; Hoffmann, J. ; Kamlah, M. ; Volkert, C. A. ; Jooss, Ch.

Applied Physics Letters, 06 February 2012, Vol.100(6) [Periódico revisado por pares]

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  • Título:
    Interplay of point defects, biaxial strain, and thermal conductivity in homoepitaxial SrTiO 3 thin films
  • Autor: Wiedigen, S. ; Kramer, T. ; Feuchter, M. ; Knorr, I. ; Nee, N. ; Hoffmann, J. ; Kamlah, M. ; Volkert, C. A. ; Jooss, Ch.
  • Assuntos: Structural, Mechanical, Optical, And Thermodynamic Properties Of Advanced Materials
  • É parte de: Applied Physics Letters, 06 February 2012, Vol.100(6)
  • Descrição: Separating out effects of point defects and lattice strain on thermal conductivity is essential for improvement of thermoelectric properties of SrTiO 3 . We study relations between defects generated during deposition, induced lattice strain, and their impact on thermal conductivity κ in homoepitaxial SrTiO 3 films prepared by ion-beam sputtering. Lowering the deposition temperature gives rise to lattice expansion by enhancement of point defect density which increases the hardness of the films. Due to a fully coherent substrate-film interface, the lattice misfit induces a large biaxial strain. However, we can show that the temperature dependence of κ is mainly sensitive on the defect concentration.
  • Idioma: Inglês

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