Abstract
The influence of hydrostatic pressure up to 1 GPa on the transition temperature to the superconducting state in orthorhombic samples of GdBa 1.5Sr 0.5Cu 3O x with the oxygen content x=6.63, 6.73 and 6.93 has been studied. The observations of T c changes were done by means of DC magnetic-susceptibility measurements. A monotonical strong increase of the pressure effect, d T c/d P, with decreasing x value has been found. This behavior differs from the complex character of the dependence of d T c/d P on the oxygen content in YBa 2Cu 3O x . In the case of GdBa 1.5Sr 0.5Cu 3O 6.63 a pressure effect d T c/d P as high as 13.7 K/GPa was obtained, higher than that reported for YBa 2Cu 3O 6.71 (11.5 K/GPa) in the region of the ortho(I)-to-ortho(II) transition.
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