Melt processing for obtaining NdBa2Cu3Oy superconductors with high Tc and large Jc

S. I. Yoo; N. Sakai; H. Takaichi; T. Higuchi; M. Murakami

doi:10.1063/1.112254

Melt processing for obtaining NdBa₂Cu₃O_y superconductors with high T_c and large J_c

S. I. Yoo, N. Sakai, H. Takaichi, T. Higuchi, M. Murakami

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Abstract

A reduced oxygen atmosphere during melt processing turned out to be critical for the fabrication of NdBa₂Cu₃O_y (Nd123) superconductors possessing high superconducting transition temperature (T_c) with a sharp transition and large critical current density (J_c) at 77 K. In a dc magnetization measurement, Nd123 superconductors melt processed in flowing a mixture gas of 1% O₂ in Ar exhibited the T_c of about 95 K and the transition width of 1.5 K with the applied field of 10 Oe. A four-probe measurement showed the zero resistive transition T_c (R=0) of about 95 K. An anomalous peak effect in the magnetization hysteresis (M-H) loops was commonly observed and lead to large magnetic J_c of 2×10⁴ A/cm² at 77 K and 2 T for the applied field H parallel to the c axis of a sample (H∥c). This achievement is attributable to a preferential formation of high T _c phase (x<0.1) among the Nd_1+xBa_2-xCu ₃O_y solid solutions in a reduced oxygen atmosphere.

Original language	English
Pages (from-to)	633-635
Number of pages	3
Journal	Applied Physics Letters
Volume	65
Issue number	5
DOIs	https://doi.org/10.1063/1.112254
Publication status	Published - 1994
Externally published	Yes

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Physics and Astronomy (miscellaneous)

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title = "Melt processing for obtaining NdBa2Cu3Oy superconductors with high Tc and large Jc",

abstract = "A reduced oxygen atmosphere during melt processing turned out to be critical for the fabrication of NdBa2Cu3Oy (Nd123) superconductors possessing high superconducting transition temperature (Tc) with a sharp transition and large critical current density (Jc) at 77 K. In a dc magnetization measurement, Nd123 superconductors melt processed in flowing a mixture gas of 1% O2 in Ar exhibited the Tc of about 95 K and the transition width of 1.5 K with the applied field of 10 Oe. A four-probe measurement showed the zero resistive transition Tc (R=0) of about 95 K. An anomalous peak effect in the magnetization hysteresis (M-H) loops was commonly observed and lead to large magnetic Jc of 2×104 A/cm2 at 77 K and 2 T for the applied field H parallel to the c axis of a sample (H∥c). This achievement is attributable to a preferential formation of high T c phase (x<0.1) among the Nd1+xBa2-xCu 3Oy solid solutions in a reduced oxygen atmosphere.",

author = "Yoo, {S. I.} and N. Sakai and H. Takaichi and T. Higuchi and M. Murakami",

year = "1994",

doi = "10.1063/1.112254",

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pages = "633--635",

journal = "Applied Physics Letters",

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T1 - Melt processing for obtaining NdBa2Cu3Oy superconductors with high Tc and large Jc

AU - Yoo, S. I.

AU - Sakai, N.

AU - Takaichi, H.

AU - Higuchi, T.

AU - Murakami, M.

PY - 1994

Y1 - 1994

N2 - A reduced oxygen atmosphere during melt processing turned out to be critical for the fabrication of NdBa2Cu3Oy (Nd123) superconductors possessing high superconducting transition temperature (Tc) with a sharp transition and large critical current density (Jc) at 77 K. In a dc magnetization measurement, Nd123 superconductors melt processed in flowing a mixture gas of 1% O2 in Ar exhibited the Tc of about 95 K and the transition width of 1.5 K with the applied field of 10 Oe. A four-probe measurement showed the zero resistive transition Tc (R=0) of about 95 K. An anomalous peak effect in the magnetization hysteresis (M-H) loops was commonly observed and lead to large magnetic Jc of 2×104 A/cm2 at 77 K and 2 T for the applied field H parallel to the c axis of a sample (H∥c). This achievement is attributable to a preferential formation of high T c phase (x<0.1) among the Nd1+xBa2-xCu 3Oy solid solutions in a reduced oxygen atmosphere.

AB - A reduced oxygen atmosphere during melt processing turned out to be critical for the fabrication of NdBa2Cu3Oy (Nd123) superconductors possessing high superconducting transition temperature (Tc) with a sharp transition and large critical current density (Jc) at 77 K. In a dc magnetization measurement, Nd123 superconductors melt processed in flowing a mixture gas of 1% O2 in Ar exhibited the Tc of about 95 K and the transition width of 1.5 K with the applied field of 10 Oe. A four-probe measurement showed the zero resistive transition Tc (R=0) of about 95 K. An anomalous peak effect in the magnetization hysteresis (M-H) loops was commonly observed and lead to large magnetic Jc of 2×104 A/cm2 at 77 K and 2 T for the applied field H parallel to the c axis of a sample (H∥c). This achievement is attributable to a preferential formation of high T c phase (x<0.1) among the Nd1+xBa2-xCu 3Oy solid solutions in a reduced oxygen atmosphere.

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JF - Applied Physics Letters

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Melt processing for obtaining NdBa₂Cu₃O_y superconductors with high T_c and large J_c

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