Structure and transport studies on nanometer YBCO/PBCGO multilayers |
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| Authors: | Tar-Pin Chen Ke Wu Qi Li Ben Chen ShonZeng Wang Hom Kandel YuChong Soo Udom Tipparach JingBiao Cui HyeWon Seo ChiJen Chen |
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| Institution: | (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 Pennsylvania, 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 |
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| Abstract: | 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 \0A thick PrBa2Cu0.80G0.2]3O7 (PBCGO) and YBCO/PBCGO multilayers are presented in this paper. |
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| Keywords: | superconductor thin films multilayers |
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