Abstract
The thermal variation of the complex magnetic susceptibility χ(T) = χ′ (T) + iχ″ (T) for the oxidic superconducting compounds Y 1-x Zr x Ba 2 Cu 3 O 7-δ, x = 0.01, 0.05 and 0.10 was investigated. The real part of the complex magnetic susceptibility χ′ (T) below critical temperature T c (χ) is negative and is lost in two stages when the temperature decreases. The inflexion point on the χ′ (T) curve corresponds to the two peaks on the temperature dependence of the imaginary part, χ″ (T), of the complex magnetic susceptibility and represents the critical temperatures for the intergranular superconductivity [Formula: see text], i = 1, 2, 3 and for the intragranular superconductivity [Formula: see text], i = 1, 2, 3. The concentration dependence of the critical temperatures is almost linear for the investigated compounds Y 1-x Zr x Ba 2 Cu 3 O 7-δ, x = 0.01, 0.05 and 0.10. The presence of the second weak peak or its absence on the χ″ (T) curves at [Formula: see text]characterizes an intense intergranular coupling.
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