ON THE EDGE BARRIER TO PENETRATION OF MAG NETIC-FIELD INTO THIN YBACUO FILMS

A change in the initial cubic dependence of the third harmonics H-3 om ega proportional to H-omega(3) is observed when the microwave field H- omega perpendicular to the surface of YBaCuO film reaches the value H- omega. Near the critical temperature Tc we obtain H-omega* proportion al to R(i)(-1/2)(T-c - T) were R(i) is the radius of i-film. The Meiss ner edge current density achieves a critical value of the field H-omeg a. Therefore, we identify H-omega* as a field required to suppress th e edge surface barrier in a thin YBaCuO film.