TSFZ法で作製したNd(Ba, Nd)_2Cu_3O_<7-δ>単結晶の超伝導特性 Superconducting Properties of Nd(Ba, Nd)_2Cu_3O_<7-δ> Single Crystals Grown by TSFZ Method
We have studied the superconducting properties of Nd(Ba<SUB>1-x</SUB>Nd<SUB>x</SUB>)<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> (Nd123, x≈0.1) single crystals grown by the traveling-solvent floating-zone method under 0.1% O<SUB>2</SUB> in Ar atmosphere. An anomalous peak effect in the magnetization hysteresis (M-B) loop is observed in the Nd123 single crystals as well as in the Nd 123 bulk crystals prepared by the oxygen-controlledmelt-growth (OCMG) method. The critical current density (Jc) of the Nd123 single crystals is 70, 600 A/cm<SUP>2</SUP> in 1.0T at 77K for the applied field perpendicular to the ab-plane. The existence of Nd and Ba composition variation in the matrix of Nd123 crystals is observed by an analytical TEM equipped with a cold field-emission gun. The high Jc value of the Nd123 single crystals in the applied field is explained by the field-induced pinning centers caused by the Nd-Ba substitutions in the Nd123 matrix.
粉体および粉末冶金 43(9), 1076-1080, 1996-09-15
Japan Society of Powder and Powder Metallurgy