Studies of F on Superconductivity in HIGH-Tc (Bi, Pb)SrCaCu(O, f) Superconductors
Abstract
In this article, the experimental results of the superconductivity in high-Tc (Bi,Pb)2Sr2Ca2Cu3(Oy,Fx), x = 0-0.84, is described. Its critical current density Jc is about ten times larger than that of undoped F sample undergoing the same technology. The causes for the increase in Jc are studied by several experimental methods. The difference in quantity between Meissner effect and shield effect indicates that the effect on superconductivity is from the weak-link regions of the superconductor grains. SEM shows that F atoms doped in BPSCCO superconductor can make its grains grow larger, arrange regularly, and increase in touch area. These changes strengthen the netty link between grains. The magnitude of residual magnetization of F-doped sample is eight times as large as that of the undoped one. The flux pinning potential U0 is calculated from the Bean model. The U0 in F-doped sample (when H = 64 Oe, x = 0.64) is eight times as large as that in the undoped one.
- Publication:
-
Modern Physics Letters B
- Pub Date:
- 1993
- DOI:
- 10.1142/S0217984993001120
- Bibcode:
- 1993MPLB....7.1127C
- Keywords:
-
- residual magnetization M0;
- pinning flux;
- pinning potential U0;
- weak links;
- critical current density Jc