Structure and transport studies on nanometer YBCO/PBCGO multilayers  

作　　者：CHEN Tar-Pin WU Ke LI Qi CHEN Ben WANG ShonZeng KANDEL Hom SOO YuChong TIPPARACH Udom CUI JingBiao SEQ HyeWon CHEN ChiJen 

机构地区：[1]Physics and Astronomy Department, University of Arkansas, Little Rock, AR 72204, USA [2]School of Physics, Peking University, Beijing 100871, China [3]Physics Department, Pennsylvania State University, University Park, PA 16802, USA [4]Physics Department, Ubon Rajathanee University, Warinchamrab, Ubon 34190, Thailand [5]Physics Department, University of Buffalo, Amherst, NY 14214, USA [6]Education Department, University of Arkansas, Little Rock, AR 72204, USA

出　　处：《Chinese Science Bulletin》2009年第15期2698-2702,共5页

摘　　要：We have fabricated M doped (M = Al, Co, Fe, Ga, Ni and Zn) PrBa2Cu3O7 (PBCO), i.e. PrBa2(Cu1-xMx)3O7. The doping levels x are 0.05, 0.10, 0.15, and 0.20. X-ray data indicated no significant second phase for substituting Cu by Al, Co, Fe and Ga up to 20%. However impurity phases were detected for Ni and Zn substituted samples with doping levels equal to and higher than 15%. At 77 K the electrical resistivity of these compounds is orders in magnitude higher than that of PBCO. We also found that although the lattice parameters in the doped samples differ from PBCO, all samples remain orthorhombic. The lattice parameters of the doped sample are very close to those of YBa2Cu3O7-δ (YBCO) and PBCO. For this reason these compounds are better materials to be used as the I-layer for YBCO SIS junctions. Results of structural and transport studies on 2000 thick PrBa2[Cu0.80G0.2]3O7 (PBCGO) and YBCO/PBCGO multilayers are presented in this paper.We have fabricated M doped （M = Al, Co, Fe, Ga, Ni and Zn） PrBa2Cu3O7（PBCO）, i.e. PrBa2（CU1-xMx）3O7. The doping levels x are 0.05, 0.10, 0.15, and 0.20. X-ray data indicated no significant second phase for substituting Cu by Al, Co, Fe and Ga up to 20%. However impurity phases were detected for Ni and Zn substituted samples with doping levels equal to and higher than 15%. At 77 K the electrical resistivity of these compounds is orders in magnitude higher than that of PBCO. We also found that although the lattice parameters in the doped samples differ from PBCO, all samples remain orthorhombic. The lattice parameters of the doped sample are very close to those of YBa2CU3O7-δ （YBCO） and PBCO. For this reason these compounds are better materials to be used as the I-layer for YBCO SIS junctions. Results of structural and transport studies on 2000 A thick PrBa2[Cu0.80G0.2]3O7 （PBCGO） and YBCO/PBCGO multilayers are presented in this paper.

关 键 词：纳米结构 多层膜 超导 运输 PrBa2Cu3O7 LATTICE 钇钡铜氧 锌掺杂 

分 类 号：O483[理学—固体物理]