Abstract
The effect of hydrostatic pressure ( p<0.6 GPa) on the superconducting critical temperature T c in YBa 2Cu 3O 7− δ –Pb(Sc 0.5Ta 0.5)O 3 (YBCO–PST) composite is measured by the method of magnetically modulated microwave absorption (MMMA). The T c dependence on the PST fraction in weight x (0, 0.25, 0.5 and 0.75) is approximated by an inverted parabola function whereas the influence of pressure on T c is represented by the equation: d T c/d p=0.61(2)−1.72(6) x. The result may be explained assuming that PST phase in YBCO–PST composite influences the superconducting carrier concentration similar to the chemical substitution in YBa 2Cu 3O 7 [J.J. Neumeier, H.A. Zimmermann, Phys. Rev. B 47 (1993) 8385]. It is suggested that ions from PST diffuse to YBCO cell during the sintering of the composite.
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