Surface resistances (R S ) have been measured for EuBa 2 Cu 3 O 7-δ (EuBCO) films grown in an ozone atmosphere. We grew BaZrO 3 dispersed EuBCO films with artificial pinning centers (APCs) in an ozone atmosphere. We have investigated the effects of BaZrO 3 dispersion into EuBCO films. The EuBCO films were grown using a pulsed laser deposition (PLD) in an ozone atmosphere on (1 0 0) SrTiO 3 substrates. We use a pure EuBCO target and an EuBCO + 1.0 wt% BaZrO 3 target. By BaZrO 3 dispersion into EuBCO films, the crystallinity of BaZrO 3 dispersed EuBCO films was poorer than that of pure EuBCO films. BaZrO 3 dispersion into EuBCO films did not improve their superconducting characteristics. Then we evaluated microstructure by using transmission electron microscopy (TEM). We observed nano-rods in BaZrO 3 dispersed EuBCO films. However, we did not observe nano-rods in BaZrO 3 dispersed EuBCO films grown in an oxygen atmosphere. The differences between an ozone and an oxygen atmosphere influence on nano-rod forming. We found that the nano-rod size is important and is strongly related to not only RE (RE: Rare Earth) ion radii but also growth conditions of films.
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