SUPERCONDUCTING PROPERTIES OF HG(BA,SR)(2)CACU2REOX FILAMENT PRODUCEDBY SOLUTION SPINNING

A superconducting: IIg-based cuprite filament was produced by a two-st ep method. The precursor (Ba1-xSrx)(2)CaCu2ReyOz (x=0.5, 0.4, 0.2, y=0 .1, 0.2) filament with diameter of 300 mu m was prepared through solut ion spinning method. After removing the volatile components, the filam ent was calcined and reacted in an evacuated quartz tube with the Hg ( Ba1-xSrx)(2)CaCu2ReyOz pellet. As the content of the substituting Sr i ncreased, the transport J(c) at 77 K and 0 T of the filament increased , in spite of decreasing the T-c. The high J(c) value more than 2000 A /cm(2) at 77 K and 0 T was attained for the filament with x=0.5. The m aximum T-c of 130 K was observed for the filament with x=0.2. The fila ment had a mixed phase of Hg1212 and Hg1223. The J(c) and T-c decrease d by post annealing in O-2 and Ar flow. Although the J(c) rapidly decr eased by applying the magnetic held, the superconductivity more than 7 7 K was maintained by applying the field of 1 T.