Temperature-dependent critical current density of Bi(Pb)-Sr-Ca-Cu-O tapes in fields up to 20 tesla
D P Hampshire; S S Oh; K Osamura; D C Larbalestier; D P Hampshire; Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA; S S Oh; Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA; K Osamura; Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA; D C Larbalestier; Appl. Supercond. Center, Wisconsin Univ., Madison, WI, USA
Журнал:
Superconductor Science and Technology
Дата:
1990-11-01
Аннотация:
The transport critical current density (J<sub>c</sub>) of silver-sheathed polycrystalline Bi(Pb)-Sr-Ca-Cu-O (BPSCCO) tapes has been measured at approximately 10 K intervals from 4.2 K up to 77 K in fields of 1-20 T. The tapes were produced by swaging, drawing and multiple final pressing and sintering steps, which developed a preferred orientation of the basal planes of the predominantly 2223 BPSCCO phase within the tape J<sub>c</sub> values greater than 10<sup>4</sup> A cm<sup>-2</sup> at 4.2 K were obtained, and these decreased smoothly as the field and temperature were increased. No evidence of any catastrophic change in J<sub>c</sub>(H) was seen at any temperature, thus suggesting that flux line lattice melting is not controlling the J<sub>c</sub> of these tapes.
463.4Кб