TEMPERATURE-CONTROLLED TAILORING OF J(C)-B PROPERTIES IN THE ND-BA-CU-O SYSTEM

It has been found that fine dispersion of Nd rich Nd1+xBa2-xCu3Oy clus ters takes place in the NdBa2Cu3Oy matrix when Nd-Ba-Cu-O superconduct ors are melt processed in a reduced oxygen atmosphere, which leads to a dramatic increase of Aux pinning. The amount of Nd-Ba substitution d epends on the growth conditions, and therefore it will be possible to control flux pinning through the control of processing conditions. In the present work, We report the modified melt-growth technique which o ffer the possibility of controlling the flux pinning and thus J(c)-B p roperties in the Nd-Ba-Cu-O samples. (C) 1998 Elsevier Science Lid. Al l rights reserved.