SUPERCONDUCTIVITY AND NORMAL-STATE PROPERTIES OF Y1-XPRXSR2CU2.7MO0.3O7-DELTA

Single-phase polycrystalline samples of Y1-xPrxSr2Cu2.7Mo0.3O7-delta ( 0 less than or equal to x less than or equal to 1) with tetragonal per ovskite structure were synthesized and investigated by X-ray-diffracti on and electrical-resistivity measurements. It is found that the T-c d ecreases monotonically with Pr concentration x from T-c similar to 33 K for x=0 to T-c similar to 12 K for x=0.7. Even though the resistivit y of PrSr(2)Cu(2.7)M(0.3)O(7-delta) exhibits a semiconducting behavior , the value of room-temperature resistivity remains the same order of magnitude as superconducting YSr2Cu2.7Mo0.3O7-delta. The possible mech anisms for the suppression of superconductivity in Y1-xPrxSr2Cu2.7Mo0. 3O(7-delta) are discussed and compared with those proposed for Y1-xPrx Ba2Cu3O7-delta.