High temperature <i>c</i>-axis resistivity of Bi2Sr2CaCu2O8+x single crystals and dependence on oxygen stoichiometry

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  • G. Yang
    School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, United Kingdom
  • J. S. Abell
    School of Metallurgy and Materials, The University of Birmingham, Birmingham, B15 2TT, United Kingdom
  • C. E. Gough
    School of Physics and Astronomy, The University of Birmingham, Birmingham, B15 2TT, United Kingdom

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<jats:p>The c-axis resistivity of Bi2Sr2CaCu2O8+x crystals has been measured as a function of thermal cycling in the range between 70 and 856 K in flowing oxygen and nitrogen. Hysteresis in the temperature-dependent c-axis resistivity provides evidence of thermally activated oxygen diffusion in and out of the crystal varying as D(T)=6×107 exp(−Δ1/kT) and D(T)=55 exp(−Δ2/kT), where Δ1=2.2 eV and Δ2=1.2 eV, respectively. Oxygen diffusion into the crystals becomes significant above T0∼595 K and out of the crystal above T1∼750 K. The implications for the stoichiometric control, superconductivity, and intrinsic high temperature dependence of the resistivity of Bi2Sr2CaCu2O8+x crystals are considered.</jats:p>

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