PERCOLATION STUDIES IN SMBA2SBO6-YBA2CU3O7-DELTA COMPOSITE SYSTEM

Percolation behavior of normal state resistivity and superconductivity of SmBa(2)SbO(6)YBa(2)CusO(7-delta) have been studied. The normal sta te and superconducting percolation threshold values of the composite a re both found to be around 22% of YBa2Cu3O7-delta in the system. The X -ray diffraction and resistivity measurements on the above percolation system have shown that there is no detectable reaction between SmBa2S bO6 ceramic and YBa2Cu3O7-delta superconductor even when the two subst ances are mixed thoroughly and sintered at 1020 degrees C. The values of exponent 't' and 'u' describing the transport properties of the sys tem are found to be 1.66 and 0.66 which agree with the theoretically e xpected value for a perfect composite system. The implications of the results are discussed.