Abstract
In this paper we report the results of hydrostatic pressure experiments up to 6 kbar on the superconducting transition temperature T c of sintered Bi 2Sr 2CaCu 2O 8+ y as a function of the oxygen content. The transition to superconductivity is detected by an AC inductance technique and pure hydrostatic pressure is generated with a helium gas system. Over the range of oxygen content studied (0.11 ≤ y ≤ 0.24), T c( y) passes through a maximum at y≅0.15. The pressure derivative (d T c/d p≅+0.15 K/k bar), however, is positive, nearly independent of the oxygen concentration, and, unlike for Tl 2Ba 2CuO 6+ y , not dependent on the temperature at which the pressure is changed.
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