Effects of calcium substitution on the superconducting properties of R(1-x)CaxBa2Cu3Oz (R=Eu, Gd, Er; 0=<x<=0.3)polycrystalline samples

The influence of Ca substitution on the superconducting properties of polycrystalline R1-xCaxBa2Cu3Oz (R = Eu, Gd, Er; x=0; 0.2; 0.25 and 0.3) samples has been studied by X-ray powder diffraction, ac susceptibility and dc magnetization measurements. The superconducting parameters such as critical te...

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Bibliographic Details
Published inarXiv.org
Main Authors Nazarova, E K, Nenkov, K, Fuchs, G, K -H Muller
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 31.01.2006
Subjects
Calcium
Clusters
Critical current (superconductivity)
Critical temperature
Flux pinning
Gadolinium
Parameters
Polycrystals
Substitutes
Superconductivity
X ray powder diffraction
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Summary:The influence of Ca substitution on the superconducting properties of polycrystalline R1-xCaxBa2Cu3Oz (R = Eu, Gd, Er; x=0; 0.2; 0.25 and 0.3) samples has been studied by X-ray powder diffraction, ac susceptibility and dc magnetization measurements. The superconducting parameters such as critical temperature, inter- and intra-granular critical current and flux pinning are found to be strongly dependent both on Ca content and type of R element. The best combination of these parameters is found for the system Gd1-xCaxBa2Cu3Oz forming R1+yBa2-yCu3Oz clusters. The level of overdoping and the type of intergrain connection, were found to be influenced by the R element and the Ca concentration. Flux pinning in Gd1-xCaxBa2Cu3Oz is connected with the presence of R1+yBa2-yCu3Oz clusters.
ISSN:2331-8422
DOI:10.48550/arxiv.0601697