TY - JOUR
T1 - Very high values of Jc obtained in NdBa2Cu3Ox by use of the U/n process
AU - Weinstein, Roy
AU - Sawh, Ravi Persad
AU - Parks, Drew
AU - Murakami, Masato
AU - Mochida, Tadashi
AU - Chikumoto, Noriko
AU - Krabbes, Gernot
AU - Bieger, Wolfgang
N1 - Funding Information:
We express our thanks to the staff of the Texas A&M Reactor for irradiations, and for helping us to obtain accurate thermal neutron fluences. We thank the staff, and Kent Ross in particular, of the TCSUH Materials Characterization Center for their assistance in microprobe studies. We gratefully acknowledge financial support from the US Army Research Office, the Welch Foundation, and the State of Texas via the Texas Center for Superconductivity. We thank the New Energy and Industrial Technology Organization (NEDO) of Japan for partial support of Collaborative R and D for Superconductivity Applications, and the German Ministry of Education and Research for support via grant no. 13N7677/4.
PY - 2002/12/15
Y1 - 2002/12/15
N2 - The U/n process has been used to introduce quasi-columnar pinning centers into Nd123, textured in 1% O2, 99% Ar. The process involves adding 235U to precursor powders of the superconductor, texturing, and irradiating with thermal neutrons. The two resulting ions, from each nuclear fission, cause aligned discontinuous electronic damage of length ∼5.4 μm, which acts as a pinning center. Best results for Jc require U deposits spaced by s ≤ 5.4 μm. This has been achieved by deposits containing two foreign elements, U and Zr, and three native elements. The deposits of UZrNdBaO and Nd422 refined by the Zr, act as additional non-aligned pinning centers. The U/n process increases Jc by a factor RJ ≥ 10, to values of Jc ∼ 274 kA/cm2 at T = 77 K, B = 666 G.
AB - The U/n process has been used to introduce quasi-columnar pinning centers into Nd123, textured in 1% O2, 99% Ar. The process involves adding 235U to precursor powders of the superconductor, texturing, and irradiating with thermal neutrons. The two resulting ions, from each nuclear fission, cause aligned discontinuous electronic damage of length ∼5.4 μm, which acts as a pinning center. Best results for Jc require U deposits spaced by s ≤ 5.4 μm. This has been achieved by deposits containing two foreign elements, U and Zr, and three native elements. The deposits of UZrNdBaO and Nd422 refined by the Zr, act as additional non-aligned pinning centers. The U/n process increases Jc by a factor RJ ≥ 10, to values of Jc ∼ 274 kA/cm2 at T = 77 K, B = 666 G.
KW - Critical current density
KW - Flux pinning
KW - Irradiation effect
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U2 - 10.1016/S0921-4534(02)01321-7
DO - 10.1016/S0921-4534(02)01321-7
M3 - Article
AN - SCOPUS:0037114342
SN - 0921-4534
VL - 383
SP - 214
EP - 222
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - 3
ER -