中文摘要：

采用脉冲激光沉积技术,在单晶SrTiO3基底上外延生长了一系列名义结构为p×（NdBa2Cu3O7-δ（m）/YBa2Cu3O7-δ（n））的多层膜和准多层膜（单元层NdBa2Cu3O7-δ较厚而YBa2Cu3O7-δ呈非连贯的岛状分布,m,n为激光脉冲数,p为重复周期）.样品的超导转变温度在87—91K范围,具体大小取决于不同的调制结构,多层膜的重复周期越大,层状界面越多,超导转变温度就越低.磁传输测量表明,准多层的样品不仅具有较高的超导转变温度,而且具有较强的磁通钉扎性能,77K零场下的临界电流密度高达4×106A/cm2,显示出良好的应用前景.

英文摘要：

By using pulsed-laser deposition technique, a series of multilayers of NdBa2Cu3O7-δ/YBa2Cu3O7-δ, namely with the structures of p × [ NdBa2Cu3O7-δ （ m）/YBa2Cu3O7-δ （n） ], are prepared on single-crystal SrTiO3, where m and n denotes the number of laser pulses and p is the number of repetetions. XRD patterns indicate that all samples are highly c-axis oriented, and the superconducting transition temperatures of these samples are in the range of 87-91 K, depending on different modulating structures. The larger the modulation period p and consequently the more the interracial surfaces, the lower the superconducting transition temperature. Magneto-transport measurements reveal that the quasi-muhilayers such as NY3 [40 × （75/5） ] （island- like YBa2 Cu3 O7-δ distributed in NdBa2 Cu3O7-δ films） exhibit not only the highest Tc, but also the best magnetic properties. The critical current density of such a quasi-muhilayers can be as high as 4 × 10^6 A/cm^2 under self fields, showing the promising potential application for coated conductors.