Y 3 Ba 5 Cu 8 O x Superconductor Under Hydrostatic Pressure

Superconducting Y3Ba5Cu8O18 samples were prepared by standard solid-state reaction method in comparison with Y1Ba2Cu3O7 sample. Resistance vs. temperature of both samples was measured under hydrostatic pressures up to 0.93 GPa using a piston–cylinder pressure cell. Applying the pressure resulted in a decrease in resistance in the normal state and an increase of the transition temperature Tc for both polycrystalline samples. This phenomenon is then explained in terms of the increase in carrier concentrations. Our results show a positive value of $${\mathrm{dT}}_{\mathrm{c}}/\mathrm{dP}$$ =1.1 K/GPa and 1.4 K/GPa for Y123 and Y358, respectively.