Magnetic-relaxation and flux-pinning study in Tl0.5Pb0.5Sr2Ca1−xPrxCu2Oy superconductor

✍ Scribed by Q. Hong; J.H. Wang

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 304 KB
• Volume: 257
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(95)00771-7

✦ Synopsis

Magnetic relaxation of the Tlo.sPb0.sSr2Cal_xPrxCu2Oy (1212) superconductor is studied by monitoring its magnetic moment as a function of time after the removal of magnetic field. The relaxation process is found to be well described by the Anderson-Kim model in the time window of our experiment. The flux-pinning potential within the superconductor is extracted through numerical fitting of the experimental data to the Anderson-Kim model. The dependence of the flux-pinning potential on the Pr doping level is investigated at different temperatures. It is found that at low temperatures, i.e., T < 20 K, the pinning potential decreases as the Pr content increases, while at higher temperatures above 30 K, there is a maximum of pinning potential at Pr content x = 0.05. This suggests that for applications at liquid-nitrogen temperature in a magnetic field, it is advantageous to use the material at the Pr content of this level to minimize dissipation of energy due to flux motion.