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


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.


Oxygen Content Oxygen Vacancy Quantitative Relation Hole Concentration Exponential Increase 
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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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