Abstract
We have reported the effect of pressure on the magnetization, and transport properties in the nominal composition Pr2Ba4Cu7O15−δ synthesized by a sol–gel technique. A reduction treatment of the as-sintered sample in vacuum causes higher superconductivity achieving Tc,on=∼30K for δ=0.94. Application of hydrostatic pressure on the oxygen depleted sample enhances its onset temperature up to 36K at 1.2GPa, indicating the nearly optimum doping level of the charge carrier in comparison to the pressure dependence of lower Tc samples with δ=0.45. Seebeck coefficient of the superconducting sample shows a metallic conduction, followed by a clear drop below Tc,on and is in its temperature dependence below 100K quite different from that of the non-superconducting one. This finding strongly suggests a dramatic change of the electronic state along the CuO double chain due to the reduction treatment for the appearance of superconductivity.
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