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Maeno, Y., Tomita, T., Kyogoku, M., Awaji, S., Aoki, Y., Hoshino, K., Minami, A. and Fujita, T. (1987) Substitution for Copper in a High-Tc Superconductor YBa2Cu3O7–δ. Nature, 328, 512-514.
https://doi.org/10.1038/328512a0

has been cited by the following article:

• TITLE: Effect of Substituting a Fraction of Cu by La on the Transport Properties of YBa2(Cu1−xLax)3O7−δ Superconductor (0 ≤ x ≤ 0.06)

  AUTHORS: A. N. Fouda

  KEYWORDS: Superconductors, X-Ray Diffraction, Transport Properties, Microstructure

  JOURNAL NAME: Materials Sciences and Applications, Vol.9 No.10, September 18, 2018

  ABSTRACT: The effect of La doping on the transport properties and superconducting characterizations of YBa2Cu3O7-δ was investigated. High quality YBa2(Cu1-xLax)3O7-δ superconductor was synthesized with La content of x = 0.00, 0.02, 0.04 and 0.06. The structure and surface morphology were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements. The best superconducting properties can be obtained for substitution of Cu by La concentration within a distinct range (x = 0.02, 0.04). The highest superconducting transition temperature Tc (≈90 K), sharpest transition to superconductivity (ΔT = 5 K) and lowest electrical resistivity (ρ = 9.2 μΩ·cm) correspond to the composition with x = 0.02. Depression and degradation of the superconducting state as (x) increases to 0.06 were observed. Excess dopant of La (x = 0.06) results in a strong decoupling of chains and planes whereas optimal La doping (x = 0.02, x = 0.04) accumulates around the grain, beside the effect of hole filling within this range can adopt an alternate route to extensive oxygen anneal.