Flux pinning in ternary (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy melt-processed superconductors

M. R. Koblischka; M. Muralidhar; M. Murakami

doi:10.1063/1.122458

Flux pinning in ternary (Nd_0.33Eu_0.33Gd_0.33)Ba₂Cu ₃O_y melt-processed superconductors

M. R. Koblischka, M. Muralidhar, M. Murakami

Research output: Contribution to journal › Article › peer-review

67 Citations (Scopus)

Abstract

The flux pinning characteristics of ternary melt-processed (Nd_0.33Eu_0.33Gd_0.33)Ba₂Cu ₃O_y (NEG) superconductors are studied in the temperature range 60≤T≤90K. NEG samples exhibit a strongly developed peak effect in the dependence of the critical current densities on the external field, H_a. The scaling of the pinning forces versus the reduced field h=H_a/H_irr (where H_irr denotes the irreversibility field) yields a peak at h₀=0.5 which is an indication of pinning provided by a spatial variation of the transition temperature. The presence of a weaker superconducting second phase is demonstrated by means of field cooling and warming experiments in fields up to 7 T. Furthermore, we discuss the possible effect of the magnetic moments of Gd and Nd on the flux pinning.

Original language	English
Pages (from-to)	2351-2353
Number of pages	3
Journal	Applied Physics Letters
Volume	73
Issue number	16
DOIs	https://doi.org/10.1063/1.122458
Publication status	Published - 1998
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "The flux pinning characteristics of ternary melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy (NEG) superconductors are studied in the temperature range 60≤T≤90K. NEG samples exhibit a strongly developed peak effect in the dependence of the critical current densities on the external field, Ha. The scaling of the pinning forces versus the reduced field h=Ha/Hirr (where Hirr denotes the irreversibility field) yields a peak at h0=0.5 which is an indication of pinning provided by a spatial variation of the transition temperature. The presence of a weaker superconducting second phase is demonstrated by means of field cooling and warming experiments in fields up to 7 T. Furthermore, we discuss the possible effect of the magnetic moments of Gd and Nd on the flux pinning.",

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AU - Koblischka, M. R.

AU - Muralidhar, M.

AU - Murakami, M.

PY - 1998

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N2 - The flux pinning characteristics of ternary melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy (NEG) superconductors are studied in the temperature range 60≤T≤90K. NEG samples exhibit a strongly developed peak effect in the dependence of the critical current densities on the external field, Ha. The scaling of the pinning forces versus the reduced field h=Ha/Hirr (where Hirr denotes the irreversibility field) yields a peak at h0=0.5 which is an indication of pinning provided by a spatial variation of the transition temperature. The presence of a weaker superconducting second phase is demonstrated by means of field cooling and warming experiments in fields up to 7 T. Furthermore, we discuss the possible effect of the magnetic moments of Gd and Nd on the flux pinning.

AB - The flux pinning characteristics of ternary melt-processed (Nd0.33Eu0.33Gd0.33)Ba2Cu 3Oy (NEG) superconductors are studied in the temperature range 60≤T≤90K. NEG samples exhibit a strongly developed peak effect in the dependence of the critical current densities on the external field, Ha. The scaling of the pinning forces versus the reduced field h=Ha/Hirr (where Hirr denotes the irreversibility field) yields a peak at h0=0.5 which is an indication of pinning provided by a spatial variation of the transition temperature. The presence of a weaker superconducting second phase is demonstrated by means of field cooling and warming experiments in fields up to 7 T. Furthermore, we discuss the possible effect of the magnetic moments of Gd and Nd on the flux pinning.

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Flux pinning in ternary (Nd_0.33Eu_0.33Gd_0.33)Ba₂Cu ₃O_y melt-processed superconductors

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