YBCO nanostructured ceramics: Relationship between doping level and temperature coefficient of electrical resistance

In this study, a linear relationship between the doping level (p) and the temperature coefficient of electrical resistance (TCR) is shown and substantiated for 20 nanostructured superconducting ceramics based on YBa2Cu3O7-δ (YBCO). Variations of ceramic production parameters, ceramic particles'...

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Bibliographic Details
Published in:The Journal of physics and chemistry of solids 2022-09, Vol.168, p.110811, Article 110811
Main Authors: Gadzhimagomedov, S.Kh, Palchaev, D.K., Murlieva, Zh.Kh, Rabadanov, M.Kh, Presnyakov, M.Yu, Yastremsky, E.V., Shabanov, N.S., Emirov, R.M., Rabadanova, A.E.
Format: Article
Language:English
Subjects:
Ceramics
Electrical properties
Hole doping
Sintering
Structure
Superconductors
YBCO
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Summary:In this study, a linear relationship between the doping level (p) and the temperature coefficient of electrical resistance (TCR) is shown and substantiated for 20 nanostructured superconducting ceramics based on YBa2Cu3O7-δ (YBCO). Variations of ceramic production parameters, ceramic particles' porosity and dispersion, average values of oxygen index or the normal phase conductivity type (metallic or semiconducting) do not violate this dependence. A distinctive feature of these ceramics is the decomposition of YBCO main superconducting phase into superconducting phases with different oxygen stoichiometries during nanostructuring. The values of p and ТCR and the change in the width of the superconducting transition (ΔTc) associated with this decay were obtained in situ by studying the temperature dependence of the resistance of each sample. The correlations between p and ТCR with ΔTc are shown. Slater's theory of elementary charge excitations formation in condensed medium, which is a system of interacting polarized ions and atoms, was used for interpretation of relationship between p and TCR established on the basis of these correlations. [Display omitted] •Nanostructured YBCO ceramics with different levels of doping.•Correlations of the level of doping and the temperature coefficient of resistance with the width of the superconducting transition.•The linear relationship between the level of doping for nanostructured YBCO with the temperature coefficient of resistance.
ISSN:0022-3697
1879-2553
DOI:10.1016/j.jpcs.2022.110811