TY - JOUR
T1 - Engineering of Jc-B characteristics of RE-Ba-Cu-O melt-textured superconductors
AU - Jirsa, M.
AU - Zablotskii, V.
AU - Muralidhar, M.
AU - Iida, K.
AU - Murakami, M.
N1 - Funding Information:
This work was supported by New Energy and Industrial Technology Development Organization (NEDO) as a part of its Research and Development of Fundamental Technologies for Superconductor Applications. M.J. acknowledges support from grant no. A1010919/99 of GA ASCR.
PY - 2002/10/1
Y1 - 2002/10/1
N2 - A skilful combination of different types of pinning centers with the aim to optimize Jc(B) performance of bulk superconductors in a wide range of magnetic fields is demonstrated on melt-textured (Nd,Eu,Gd)Ba2Cu3O7-δ and NdBa2Cu3O7-δ materials. In this contribution we show (i) the distinct effect of different types of micrometer-size secondary phase particles on Jc(B) dependence at low fields; (ii) possibility to produce materials with either high-current densities at moderate fields or with a flat Jc(B) curve extending to high fields, via appropriate choice of Nd:Eu:Gd ratio in NEG-123 matrix; (iii) extremely high-irreversibility field (≈9 T at 77 K) in NEG-123 samples Eu/Gd > 1 and a small content of NEG-211; (iv) twin structure effect in melt-textured Nd-123 doped by micron-sized Nd-211 particles resulting at low temperatures in a field independent Jc(B) extending to very high fields (at 40 K above 10 T). Vast majority of the data could be interpreted in terms of additive contributions of pinning on point-like and large defects.
AB - A skilful combination of different types of pinning centers with the aim to optimize Jc(B) performance of bulk superconductors in a wide range of magnetic fields is demonstrated on melt-textured (Nd,Eu,Gd)Ba2Cu3O7-δ and NdBa2Cu3O7-δ materials. In this contribution we show (i) the distinct effect of different types of micrometer-size secondary phase particles on Jc(B) dependence at low fields; (ii) possibility to produce materials with either high-current densities at moderate fields or with a flat Jc(B) curve extending to high fields, via appropriate choice of Nd:Eu:Gd ratio in NEG-123 matrix; (iii) extremely high-irreversibility field (≈9 T at 77 K) in NEG-123 samples Eu/Gd > 1 and a small content of NEG-211; (iv) twin structure effect in melt-textured Nd-123 doped by micron-sized Nd-211 particles resulting at low temperatures in a field independent Jc(B) extending to very high fields (at 40 K above 10 T). Vast majority of the data could be interpreted in terms of additive contributions of pinning on point-like and large defects.
KW - Flux pinning
KW - Melt processing
KW - REBaCuO
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U2 - 10.1016/S0921-4534(02)01526-5
DO - 10.1016/S0921-4534(02)01526-5
M3 - Article
AN - SCOPUS:4243913604
VL - 378-381
SP - 707
EP - 712
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - PART 1
ER -