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Effects of vacuum annealing on the transport property of La \(\mathsf{_{0.67}}\)Sr \(\mathsf{_{0.33}}\)MnO \(\mathsf{_{3-\delta}}\) films

  • J. R. SunEmail author
  • H. W. Yeung
  • H. K. Wong
  • T. Zhu
  • B. G. Shen
Article

Abstract.

Effects of oxygen content on the transport behavior of epitaxial La2/3Sr 1/3MnO\(_{3-\delta}\) films on (110) NdGaO3 and (001) SrTiO3 substrates have been experimentally studied. A quantitative relation between the temperature of metal-to-insulator transition (T p ) and the content of oxygen vacancies is established, and it is found that oxygen non-stoichiometry causes a monotonic decrease of T p . A comparison to crystals La1-x Sr x MnO3 indicates that the reduction of hole concentration due to the incorporation of anionic vacancies dominates the variation of T p , while the vacancies themselves influence the detailed features of the T p -\(\delta \) dependence. Strain in the film affects the effects of oxygen deficiency, and the metal-to-insulator transition disappears at a smaller \(\delta \) value in tensily stressed films. In the temperature region above T p , oxygen vacancies affect the resistive behavior of the films mainly by modulating the content of Mn4 + . In contrast, extra effects due to the scattering of oxygen vacancies become important at low temperatures, causing an exponential increase of resistivity with \(\delta \). A further analysis indicates that oxygen deficiency enhances magnetic scattering, and leads to a resistivity upturn of the form \(-\ln(T)\) when \(\delta \) is significant.

Keywords

Oxygen Content Oxygen Vacancy Quantitative Relation Hole Concentration Exponential Increase 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin/Heidelberg 2003

Authors and Affiliations

  • J. R. Sun
    • 1
    • 2
    Email author
  • H. W. Yeung
    • 2
  • H. K. Wong
    • 2
  • T. Zhu
    • 1
  • B. G. Shen
    • 1
  1. 1.State Key Laboratory for MagnetismInstitute of Physics and Center for Condensed Matter Physics, The Chinese Academy of SciencesBeijingP.R. China
  2. 2.Department of PhysicsThe Chinese University of Hong KongHong KongP.R. China

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