Abstract
The superconductivity of Pr2Ba4Cu7O15-δ (Pr247) is realized at the CuO double-chains. The oxygen deficiency δ dependence of the superconducting transition temperature Tc shows the bell-like curve with the maximum of Tc = 20.6 K at δ = 0.64. We investigated the pressure effects on the double-chain superconductivity of Pr247. The resistivity was measured under the pressure of 10 GPa produced by a modified Bridgman anvil type cell. With increasing pressure above 3 GPa, the superconductivity was suppressed and disappeared. The temperature dependence of the resistivity shows a semiconductor like behavior above 5 GPa. The x-ray diffraction using a diamond anvil cell under hydrostatic condition shows that no structural transition occurs below 10 GPa.
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