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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

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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.

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Authors and Affiliations

  1. State Key Laboratory for Magnetism, Institute of Physics and Center for Condensed Matter Physics, The Chinese Academy of Sciences, 100080, Beijing, P.R. China

    J. R. Sun, T. Zhu & B. G. Shen

  2. Department of Physics, The Chinese University of Hong Kong, Hong Kong, P.R. China

    J. R. Sun, H. W. Yeung & H. K. Wong

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  1. J. R. Sun
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  2. H. W. Yeung
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  3. H. K. Wong
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  4. T. Zhu
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  5. B. G. Shen
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Correspondence to J. R. Sun.

Additional information

Received: 8 August 2003, Published online: 24 October 2003

PACS:

75.30.-m Intrinsic properties of magnetically ordered materials - 73.50.-h Electronic transport phenomena in thin films - 68.60.-p Physical properties of thin films, nonelectronic

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Sun, J.R., Yeung, H.W., Wong, H.K. et al. Effects of vacuum annealing on the transport property of La \(\mathsf{_{0.67}}\)Sr \(\mathsf{_{0.33}}\)MnO \(\mathsf{_{3-\delta}}\) films. Eur. Phys. J. B 35, 481–491 (2003). https://doi.org/10.1140/epjb/e2003-00301-6

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  • DOI: https://doi.org/10.1140/epjb/e2003-00301-6

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