在(100)SrTiO_3上用PLD制备YBa_2Cu_3O_(7-δ)/Eu_2CuO_4/LaNiO_3三层结构  

YBa_2Cu_3O_(7-δ)}/Eu_2CuO_4/LaNiO_3 TRILAYERS ON (100)SrTiO_3 BY PULSED LASER DEPOSITION

作　　者：孙国柱[1] 吴培亨[1] 吉争鸣[1] 范世雄[1] 杨森祖[1] 许伟伟[1] 康琳[1] 

机构地区：[1]南京大学电子科学与工程系超导电子研究所,南京210093

出　　处：《低温物理学报》2003年第3期184-187,共4页Low Temperature Physical Letters

基　　金：国家重点基础研究发展规划项目 (G19990 6 4 6 );国家高技术研究发展计划资助的课题~~

摘　　要：钙钛矿结构的金属氧化物LaNiO3与高温超导体YBa2 Cu3O7-δ有着相近的晶格常数 ,并且有良好的导电性 .我们在 (10 0 )SrTiO3基片上 ,用脉冲激光沉积法 (PLD)成功的制备了单取向的LaNiO3,其表面起伏的均方根为 1nm ,电阻温度特性呈金属性 .在此基础上 ,我们又原位制备了YBa2 Cu3O7-δ/Eu2 CuO4 /LaNiO3三层结构 .实验分析表明 ,高温超导薄膜YBa2 Cu3O7-δ单一取向 ,临界温度在 85K以上 ,超导转变宽度小于 1.5K .这一结构对于研究高温超导体的准粒子注入和采用SIS或者SINIS结构构成高温超导约瑟夫森结等方面有着重要意义 .A conductive metallic oxide with low resistivity, LaNiO-3 (LNO) is of the perovskite-type; its pseudocubic lattice parameter a0.383nm is close to that of YBa-2Cu-3O-{7-δ} (YBCO). High single oriented LNO film has been successfully grown on (100) SrTiO-3 substrates by pulsed laser deposition (PLD). Its surface is very smooth with the roughness about 1nm mean square root. And it possesses good metallic characteristics. YBa-2Cu-3O-{7-δ}/Eu-2CuO-4/LaNiO-3 trilayers have been grown on (100) SrTiO-3 substrates in situ by PLD. The top YBCO is highly single oriented and presents good superconducting properties with critical temperature above 85K and sharp transition width less than 1.5K. Our process should be very useful in the study of both quasi-particle injection into HTS and HTS Josephson junctions of SNS or SINIS.

关 键 词：钙钛矿结构 PLD 高温超导体 准粒子注入 SRTIO3 制备 多层膜 三层结构 钇钡铜氧化物 铕铜氧化物 铌酸镧 YBa2Cu3O7-δ/Eu2CuO4/LaNiO3 

分 类 号：O511.4[理学—低温物理]