Refinement of secondary phase particles for high critical current densities in (Nd, Eu, Gd)–Ba–Cu–O superconductors
We have prepared (Nd0. 33Eu0. 33Gd0. 33) Ba2Cu3Oy (NEG') superconductors by means
of melt-processing under a partial oxygen pressure of 0.1%. In these samples, we achieved
a large critical current density, Jc, of 6.8× 104 A/cm2 at T= 77 K and in an applied magnetic
field, Ha= 2.5 T. Furthermore, the irreversibility field, Hirr, exceeds 7 T at 77 K for fields
applied parallel to the c-axis of the sample. As additional pinning sites, we introduced up to
40 mol%(Nd, Eu, Gd) 2BaCuO5 (NEG-211) particles plus Pt in analogy to YBa2Cu3Oy …
of melt-processing under a partial oxygen pressure of 0.1%. In these samples, we achieved
a large critical current density, Jc, of 6.8× 104 A/cm2 at T= 77 K and in an applied magnetic
field, Ha= 2.5 T. Furthermore, the irreversibility field, Hirr, exceeds 7 T at 77 K for fields
applied parallel to the c-axis of the sample. As additional pinning sites, we introduced up to
40 mol%(Nd, Eu, Gd) 2BaCuO5 (NEG-211) particles plus Pt in analogy to YBa2Cu3Oy …
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