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

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

doi:10.1063/1.358049

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

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

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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 J_c1 (due to weakly linked grains) and a field-independent component J_c0 (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 J_c1 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 language	English
Pages (from-to)	7118-7120
Number of pages	3
Journal	Journal of Applied Physics
Volume	76
Issue number	10
DOIs	https://doi.org/10.1063/1.358049
Publication status	Published - 1994
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1063/1.358049

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title = "Na-doping effect on the magnetic properties of the YBCO ceramics",

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.",

author = "T. Nurgaliev and S. Miteva and I. Nedkov and A. Veneva and M. Taslakov",

year = "1994",

doi = "10.1063/1.358049",

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T1 - Na-doping effect on the magnetic properties of the YBCO ceramics

AU - Nurgaliev, T.

AU - Miteva, S.

AU - Nedkov, I.

AU - Veneva, A.

AU - Taslakov, M.

PY - 1994

Y1 - 1994

N2 - 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.

AB - 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.

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

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