Strong pinning in ternary (Nd-Sm-Gd)Ba2Cu3O y superconductors

M. Muralidhar; S. Nariki; M. Jirsa; Y. Wu; M. Murakami

doi:10.1063/1.1447582

Strong pinning in ternary (Nd-Sm-Gd)Ba₂Cu₃O _y superconductors

M. Muralidhar, S. Nariki, M. Jirsa, Y. Wu, M. Murakami

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38 Citations (Scopus)

Abstract

We have studied the flux pinning in melt-textured (Nd_0.33Sm _0.33Gd_0.33)Ba₂Cu₃O_y NSG-123 superconductors with various numbers of Gd₂BaCuO₅ (Gd-211) particles. Transmission electron microscopy (TEM) showed that submicron Gd-211 particles are uniformly distributed in the superconductive matrix. Dark-field TEM observations further showed that a high density of RE rich RE_1+xBa_2-xCu₃O_y (RE-123ss) clusters 3-10 nm in size were distributed in the NSG-123 matrix. A strongly developed fishtail was observed in the magnetization hysteresis loops of all the samples. A critical current density of 100 kA/cm² (77 K) was achieved at the secondary peak field of 2 T for the H∥c axis in the NSG-123 sample with 10 mol% Gd-211. Large grain NSG-123 pellets with 30 mol% Gd-211 and 20 wt% AgO ₂, 30 mm in diameter and 15 mm in height, exhibited a single-cone profile with a peak value of 1.2 T at 77 K. A higher trapped-field value of 1.5 T was recorded at 2 T, reflecting the secondary peak effect.

Original language	English
Pages (from-to)	1016-1018
Number of pages	3
Journal	Applied Physics Letters
Volume	80
Issue number	6
DOIs	https://doi.org/10.1063/1.1447582
Publication status	Published - 2002 Feb 11
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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abstract = "We have studied the flux pinning in melt-textured (Nd0.33Sm 0.33Gd0.33)Ba2Cu3Oy NSG-123 superconductors with various numbers of Gd2BaCuO5 (Gd-211) particles. Transmission electron microscopy (TEM) showed that submicron Gd-211 particles are uniformly distributed in the superconductive matrix. Dark-field TEM observations further showed that a high density of RE rich RE1+xBa2-xCu3Oy (RE-123ss) clusters 3-10 nm in size were distributed in the NSG-123 matrix. A strongly developed fishtail was observed in the magnetization hysteresis loops of all the samples. A critical current density of 100 kA/cm2 (77 K) was achieved at the secondary peak field of 2 T for the H∥c axis in the NSG-123 sample with 10 mol% Gd-211. Large grain NSG-123 pellets with 30 mol% Gd-211 and 20 wt% AgO 2, 30 mm in diameter and 15 mm in height, exhibited a single-cone profile with a peak value of 1.2 T at 77 K. A higher trapped-field value of 1.5 T was recorded at 2 T, reflecting the secondary peak effect.",

author = "M. Muralidhar and S. Nariki and M. Jirsa and Y. Wu and M. Murakami",

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AU - Muralidhar, M.

AU - Nariki, S.

AU - Jirsa, M.

AU - Wu, Y.

AU - Murakami, M.

PY - 2002/2/11

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AB - We have studied the flux pinning in melt-textured (Nd0.33Sm 0.33Gd0.33)Ba2Cu3Oy NSG-123 superconductors with various numbers of Gd2BaCuO5 (Gd-211) particles. Transmission electron microscopy (TEM) showed that submicron Gd-211 particles are uniformly distributed in the superconductive matrix. Dark-field TEM observations further showed that a high density of RE rich RE1+xBa2-xCu3Oy (RE-123ss) clusters 3-10 nm in size were distributed in the NSG-123 matrix. A strongly developed fishtail was observed in the magnetization hysteresis loops of all the samples. A critical current density of 100 kA/cm2 (77 K) was achieved at the secondary peak field of 2 T for the H∥c axis in the NSG-123 sample with 10 mol% Gd-211. Large grain NSG-123 pellets with 30 mol% Gd-211 and 20 wt% AgO 2, 30 mm in diameter and 15 mm in height, exhibited a single-cone profile with a peak value of 1.2 T at 77 K. A higher trapped-field value of 1.5 T was recorded at 2 T, reflecting the secondary peak effect.

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Strong pinning in ternary (Nd-Sm-Gd)Ba₂Cu₃O _y superconductors

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