Na-doping effect on the magnetic properties of the YBCO ceramics

T. Nurgaliev, S. Miteva, I. Nedkov, A. Veneva, M. Taslakov

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

The ac magnetization and the microwave surface resistance (at 12 GHz) were measured on a series of Na-doped YBCO ceramic samples at 77 K. Their magnetic behavior was explained on the basis of the modified critical state model by taking into account the existence of a field-dependent component Jc1 (due to weakly linked grains) and a field-independent component Jc0 (due to perfectly linked grains) in the bulk critical current density of the samples. The Na and Cu remaining after the heat treatment of the samples changed the intergranular medium parameters and impeded the correlation between the grains. As a result, an increase of the Na concentration led to a decrease of the specimens critical current density and an increase of their surface resistance. At small Na concentrations, a certain increase of Jc1 was observed, which can be explained by taking into account the possibility of partial pinning of Josephson vortices in the "weakly seeded" places in the intergranular media.

Original languageEnglish
Pages (from-to)7118-7120
Number of pages3
JournalJournal of Applied Physics
Volume76
Issue number10
DOIs
Publication statusPublished - 1994 Dec 1
Externally publishedYes

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ceramics
magnetic properties
critical current
current density
heat treatment
vortices
microwaves
magnetization

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Na-doping effect on the magnetic properties of the YBCO ceramics. / Nurgaliev, T.; Miteva, S.; Nedkov, I.; Veneva, A.; Taslakov, M.

In: Journal of Applied Physics, Vol. 76, No. 10, 01.12.1994, p. 7118-7120.

Research output: Contribution to journalArticle

Nurgaliev, T, Miteva, S, Nedkov, I, Veneva, A & Taslakov, M 1994, 'Na-doping effect on the magnetic properties of the YBCO ceramics', Journal of Applied Physics, vol. 76, no. 10, pp. 7118-7120. https://doi.org/10.1063/1.358049
Nurgaliev, T. ; Miteva, S. ; Nedkov, I. ; Veneva, A. ; Taslakov, M. / Na-doping effect on the magnetic properties of the YBCO ceramics. In: Journal of Applied Physics. 1994 ; Vol. 76, No. 10. pp. 7118-7120.
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