Characterization and superconducting properties of (YSN)BCO composites made a top-seeded melt growth process
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We have investigated the crystal growth and superconducting properties of c-axis oriented (Y0.5Sm0.25Nd0.25)Ba2Cu3Oy [(YSN)- 123] composite oxides by a top-seeded melt growth (TSMG) process in air. A melt-textured NdBa2Cu3Oy (Nd-123) single crystal was used as a seed for achieving the c-axis(001) alignment of large grains perpendicular to the surface of a (YSN)-123 composite. A sample prepared by this method showed a well-textured microstructure, and (Y0.5Sm0.25Nd0.25)2BaCuO5 [(YSN)211] nonsuperconducting particles were uniformly dispersed in large (YSN)123 superconducting matrix grains. The melt-textured (YSN)-123 sample showed an onset of the superconducting transition (Tc) at 93 K. The magnetization hysteresis (M-H) values (300 emu/cm3 at 4 T and 60 K) of the (YSN)-123 sample exhibited enhanced flux pinning, compared with a (RE0.5Y0.5)Ba2Cu3Oy [(REY)-123, RE: Sm, Nd] sample.
Abstract
We have investigated the crystal growth and superconducting properties of c-axis oriented (Y0.5Sm0.25Nd0.25)Ba2Cu3Oy [(YSN)- 123] composite oxides by a top-seeded melt growth (TSMG) process in air. A melt-textured NdBa2Cu3Oy (Nd-123) single crystal was used as a seed for achieving the c-axis(001) alignment of large grains perpendicular to the surface of a (YSN)-123 composite. A sample prepared by this method showed a well-textured microstructure, and (Y0.5Sm0.25Nd0.25)2BaCuO5 [(YSN)211] nonsuperconducting particles were uniformly dispersed in large (YSN)123 superconducting matrix grains. The melt-textured (YSN)-123 sample showed an onset of the superconducting transition (Tc) at 93 K. The magnetization hysteresis (M-H) values (300 emu/cm3 at 4 T and 60 K) of the (YSN)-123 sample exhibited enhanced flux pinning, compared with a (RE0.5Y0.5)Ba2Cu3Oy [(REY)-123, RE: Sm, Nd] sample.