AC susceptibility and microstructure of alkali doped polycrystalline YBCO HTSC materials

A. Veneva, D. K. Petrov, P. Dittrich, M. J. Naughton

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

In this work we report experimental results concerning the influence of potassium and excess copper additions on the AC complex susceptibility and microstructural development within polycrystalline YBCO high-temperature superconductors with nominal composition Y1-0.2xBa2-0.2xKxCu3Oy (x = 0-1.20). The real (X′) and the imaginary (X″) parts of the complex magnetic susceptibility of YBCO were recorded as a function of the temperature at various magnetic fields up to 10 Oe. From these data the intergranular critical current densities were calculated using Bean's critical state model. A proper concentration x, which is approximately equal to x = 0.40 in the initial Y1-0.2xBa2-0.2xKxCu3Oy batch was found to improve the Josephson coupling between the grains.

Original languageEnglish
Pages (from-to)230-234
Number of pages5
JournalPhysica C: Superconductivity and its applications
Volume271
Issue number3-4
DOIs
Publication statusPublished - 1996 Nov 10
Externally publishedYes

Keywords

  • AC susceptibility of superconductors
  • Critical current density
  • Grain boundaries
  • Microstructure
  • Substitution effects
  • Weak links

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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