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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.
A series of multilayer films and quasi-multilayer films with p × (NdBa2Cu3O7-δ (m) / YBa2Cu3O7-δ (n)) epitaxially grown on single-crystal SrTiO3 substrate were fabricated by pulsed laser deposition technique (unit layer NdBa2Cu3O7 δ is thick and YBa2Cu3O7-δ is non-coherent island-like distribution, m and n are the number of laser pulses and p is the repetition period.) The sample has a superconducting transition temperature in the range of 87-91K depending on the different modulation structures , The larger the repeat period of multi-layer film, the more the layered interface, the lower the superconducting transition temperature.The magnetic transmission measurements show that the quasi-multilayer samples not only have higher superconducting transition temperature, but also have stronger magnetic Through the pinning performance, the critical current density at 77K zero field reaches 4 × 106A / cm2, which shows a good application prospect.