Correlation between surface resistance of Yba 2 Cu 3 O 7-δ thin films and oxygen pressure during deposition process

In this paper, we study the correlation between the depositing oxygen pressure and surface resistance R-s of YBa2Cu3O7-delta (YBCO) films fabricated by pulsed-laser deposition method. It reveals that oxygen pressure has great influence on R-s. In terms of minimum R-s, there exists optimum value of oxygen pressure which is different from the optimum oxygen pressure for maximum T-c. The crystalline orientation and surface morphologies of the films are helpful in understanding the variations of R-s with the oxygen pressure.