低激光能流沉积高质量的NdB_2Cu_3O_(7-x)/YBa_2Cu_3O_(7-y)高温超导薄膜  

THE HIGH-QUALITY NdBa_2Cu_3O_x/YBa_2Cu_3O_ySUPERCONDUCTING FILM PREPARED BY THE PULSED-LASER DEPOSITION AT LOW LASER FLUENCY

作　　者：张正平[1] 王殿生[2] 傅兴华[2] 杨健[2] 

机构地区：[1]浙江大学信息与电子科学系,杭州310027 [2]贵州大学物理与电子科学系

出　　处：《低温物理学报》2001年第3期167-173,共7页Low Temperature Physical Letters

基　　金：贵州省自然科学基金资助项目 (No .9930 33)

摘　　要：采用脉冲激光方法 ,先在YSZ(yttriastablizedzirconia)衬底上制备 (YBa2 Cu3O7-y) /YSZ高温超导薄膜 ,再用较低的激光能流密度 ( 1.2～ 1.0Jcm- 2 )沉积一层NBCO(NdB2 Cu3O7-x)薄膜 ,形成NBCO/YBCO/YSZ双层超导薄膜 .在制备完当时 ,存放 4 0天和存放 4 0 0天后分别对薄膜进行了X射线衍射分析和电阻 温度曲线测量 .结果表明 ,NBCO/YBCO/YSZ双层膜的转变温度、结晶度和表面稳定性及光滑度都优于YBCO/YSZ薄膜的 .在YBCO/YSZ上使用较低的激光能量可以制备出优质的c轴取向NBCO高温超导薄膜 .The high temperature superconducting YBCO(YBa-2Cu-3O-{7-y})thin films were first prepared on YSZ(yttria stablized zirconia)by the pulsed laser ablation technique, and then a top NBCO(NdBa-2Cu-3O-{7-x})layer was added to the YBCO/YSZ superconducting thin film at low laser fluency of 1.2～1.0Jcm+{-2} to form NBCO/YBCO/YSZ multilayer. It could be shown that the NBCO/YBCO/YSZ multilayer films were superior to YBCO/YSZ thin films, with repect to surface stability and smoothness, crystallinity and transition temperature (T-c), based on the X-ray diffraction (XRD) analyses and the measurements of resistance-temperature (R-T) curve. This study suggests that the high-quality c-axis oriented superconducting NBCO thin films can be fabricated on the YBCO/YSZ by the laser depositon method at low laser energy.

关 键 词：低激光能流沉积 NBCO 高温超导薄膜 

分 类 号：O511[理学—低温物理]