THE SURFACE-RESISTANCE OF BULK POLYCRYSTALLINE YBA2CU3O7-X

The surface resistance of viscous processed and powder processed bulk polycrystalline YBa2Cu3O7-X specimens have been measured as a function of frequency (27-38GHz) and temperature (10-150K) using an endwall re placement technique, The surface resistance of the viscous processed m aterial within the 9-38GHz frequency region gives a crossover freguenc y of 7.6GHz. The temperature dependence of the superconducting state o f material from both processing methods can be described by a two-gap BSC model which treats the sample as a network of weakly coupled super conducting grains.