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Irreversibility field above 14 T at 77 K in (Nd--Eu--Gd)Ba2Cu3Oy

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4 Author(s)
Muralidhar, M. ; Supercond. Res. Lab., Tokyo, Japan ; Sakai, N. ; Jirsa, M. ; Murakami, M.

In (Nd0.33Eu0.38Gd0.28)Ba2Cu3Oy, a new type of nanometer-scale pinning center was created by choosing an appropriate matrix chemical ratio. Such a pinning center could be controlled via externally added small quantity of 211 (NEG-211 or Gd-211) secondary phase. Microstructure analysis combined with magnetic characterization clarified that the sample with a high irreversibility field always exhibits chemical modulation and formation of a special nanometer-scale lamellar structure. High magnification STM observations revealed that the nano-lamellas consist of rows of aligned NEG-rich clusters 3 to 4 nm in size. This new material with the Nd:Eu:Gd ratio of 1:1.25:0.85 combined with 5 mol% 211 secondary phase exhibits the high secondary peak position at around 4.5 T and the irreversibility field over 14 T at 77 K for Ha||c-axis.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 2 )