Abstract
In this report, Ca-doped Pr-123 compounds have been synthesized under high pressure and the highest T c up to 115K is achieved in Pr 0.5Ca 0.5Ba 2Cu 3O y. According to the X-ray analysis and thermal-electric power data, the Ca-ions induced carriers and reduced occupation of Pr ion in Ba site. These two effects could be the reason for the occurrence of superconductivity with higher T c. Also, magnetic susceptibility under high pressure has been carried out by ac mutual inductance measurements. It showed that T c increased linearly with pressure at dT c/dP = +0.10 K/kbar up to 20 kbar. The pressure effect could be explained by carrier increase due to the shorter distance between Ca ion and CuO 2 plane.
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