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YBa_2Cu_3O_(7-delta) thin films with BaO precipitates

机译：具有BaO沉淀的YBa_2Cu_3O_（7-delta）薄膜

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摘要

A number of studies have been focused on the characterization of impurity phases that were incorporated in YBa_2Cu_3O_(7-delta) (YBCO) thin films prepared by various methods. The results of the studies have shown that the formation of a second phase may strongly influence the growth mechanism and superconducting properties of YBCO films. The relation between impurity phases and film morphology has been revealed by scanning electron microscopy, which showed that the surface roughness increases with the decrease of the Cu/Y or Ba/Y, whereas increasing the Cu content leads to the formation of small particles of CuO phase on the film surface. Recently, some groups have reported that Y_2O_3, CuO, Y_2Cu_2O_5 and Y_2BaCuO_5 precipitates were present in laser-ablated films, Y_2O_3 in sputtered films and CuYO2 in films prepared by electron beam coevaporation. These second phases may act as flux pinning sites, raising the critical current density. So the nonstoichiometric YBCO thin films, either Cu or Y richin composition, can stiE exhibit excellent superconducting transition temperature T_(co) and critical current density J_c comparable to the stoichiometric thin films. However, the identification of BaO impure phase and its effect on the superconductingproperties of YBCO films have not been reported up to now.
机译：许多研究集中在掺入通过各种方法制备的YBa_2Cu_3O_（7-δ）（YBCO）薄膜中的杂质相的表征。研究结果表明，第二相的形成可能强烈影响YBCO膜的生长机理和超导性能。通过扫描电子显微镜揭示了杂质相与膜形态之间的关系，表明表面粗糙度随Cu / Y或Ba / Y的减少而增加，而Cu含量的增加导致CuO小颗粒的形成。膜表面上的相。最近，一些研究小组报告说，激光烧蚀膜中存在Y_2O_3，CuO，Y_2Cu_2O_5和Y_2BaCuO_5沉淀，溅射膜中存在Y_2O_3，电子束共蒸发制备的膜中存在CuYO2。这些第二相可以充当磁通钉扎点，从而提高临界电流密度。因此，非化学计量的YBCO薄膜，无论是Cu还是富含Y的成分，都可以显示出与化学计量薄膜相当的超导过渡温度T_（co）和临界电流密度J_c。然而，BaO不纯相的鉴定及其对YBCO薄膜超导性能的影响至今尚未见报道。

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