TY - JOUR
T1 - Partial melting in filamentary NSG123 superconductors under various oxygen atmospheres
AU - Ikebe, Yumiko
AU - Ban, Eriko
AU - Matsuoka, Yoshiharu
AU - Nishijima, Gen
AU - Watanabe, Kazuo
N1 - Funding Information:
Manuscript received August 27, 2007. This work was supported in part by the 21st Century COE Program of the Ministry of Education, Culture, Sports, Science and Technology, Japan. Y. Ikebe, E. Ban, and Y. Matsuoka are with the Department of Materials Science and Engineering, Meijo University, Nagoya 468-8502, Japan (e-mail: m0641501@ccmailg.meijo-u.ac.jp). G. Nishijima and K. Watanabe are with the High Field Laboratory for Superconducting Materials, IMR, Tohoku University, Sendai 980-8577, Japan. Digital Object Identifier 10.1109/TASC.2008.921213
PY - 2008/6
Y1 - 2008/6
N2 - Precursor filaments with starting composition (Nd0.33,Sm 0.33,Gd0.33) : Ba : Cu = 1.18 : 2.12 : 3.09 were prepared by a solution spinning method. Samples were partially melted at temperature range of 1020-1090° C in flowing 0.1%O2 + Ar, 1%O2 + Ar and 20%O2 + Ar and then oxygenated in pure 100%O2 gas. The Tc value decreased from 91.3 K to 88.8 K with increasing oxygen concentration in atmosphere gas. A transport Jc value higher than 104 A/cm3 at 77 K and 0 T was showed over a wide temperature range of 1030-1080°C in 0.1%O2 + Ar and 1040-1090°C in 1%O2 + Ar. Especially, the 0.1%O2 + Ar sample partially melted at 1050°C and the 1%O2 + Ar sample at 1060° C exhibited the highest Jc value of 2.7 × 10 4 A/cm2 and 2.5 × 104 A/cm2, respectively. The transport Jc value of the sample melted in flowing 0.1%O3 + Ar was maintained higher than 2.4 × 103 A/cm3 at 77 K in applied magnetic fields up to 17 T. On the other hand, the maximum Jc value at 77 K and 0 T for the sample treated in 20%O2 + Ar melted at 1080°C showed 5.4 × 103 A/cm2 at most, and the superconductivity was disappeared at magnetic field of 7 T.
AB - Precursor filaments with starting composition (Nd0.33,Sm 0.33,Gd0.33) : Ba : Cu = 1.18 : 2.12 : 3.09 were prepared by a solution spinning method. Samples were partially melted at temperature range of 1020-1090° C in flowing 0.1%O2 + Ar, 1%O2 + Ar and 20%O2 + Ar and then oxygenated in pure 100%O2 gas. The Tc value decreased from 91.3 K to 88.8 K with increasing oxygen concentration in atmosphere gas. A transport Jc value higher than 104 A/cm3 at 77 K and 0 T was showed over a wide temperature range of 1030-1080°C in 0.1%O2 + Ar and 1040-1090°C in 1%O2 + Ar. Especially, the 0.1%O2 + Ar sample partially melted at 1050°C and the 1%O2 + Ar sample at 1060° C exhibited the highest Jc value of 2.7 × 10 4 A/cm2 and 2.5 × 104 A/cm2, respectively. The transport Jc value of the sample melted in flowing 0.1%O3 + Ar was maintained higher than 2.4 × 103 A/cm3 at 77 K in applied magnetic fields up to 17 T. On the other hand, the maximum Jc value at 77 K and 0 T for the sample treated in 20%O2 + Ar melted at 1080°C showed 5.4 × 103 A/cm2 at most, and the superconductivity was disappeared at magnetic field of 7 T.
KW - Critical current density
KW - Filamentary NSG123 superconductors
KW - Magnetic field behavior
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U2 - 10.1109/TASC.2008.921213
DO - 10.1109/TASC.2008.921213
M3 - Article
AN - SCOPUS:45149114283
VL - 18
SP - 1204
EP - 1207
JO - IEEE Transactions on Applied Superconductivity
JF - IEEE Transactions on Applied Superconductivity
SN - 1051-8223
IS - 2
M1 - 4494436
ER -