ANGULAR SCALING OF THE MICROWAVE MAGNETODISSIPATION IN BI2SR2CACU2O8+X

We report measurements of the surface resistance at 21 GHz as a functi on of the magnetic field H and of the field orientation theta with res pect to the (a,b) planes, for different temperatures, on epitaxial Bi2 Sr2CaCu2O8 films. We find clear experimental evidence for the angular scaling of the microwave surface resistance, at all the temperatures i nvestigated, with no need for specific hypothesis on the origin of the dissipation. The scaling is perfect over four decades of the magnetic field. The angular scaling function is identified with the quasi-two- dimensional, thin-film formula.