Positron annihilation and magnetization studies of proton irradiated polycrystalline textured Bi2Sr2CaCu2O8+δ and Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10+δ superconductors

✍ Scribed by Pintu Sen; P.M.G. Nambissan; S.K. Bandyopadhyay; P. Barat; P. Mukherjee

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 172 KB
• Volume: 262
• Category: Article
• ISSN: 0375-9601
• DOI: 10.1016/s0375-9601(99)00694-5

✦ Synopsis

Proton irradiations on polycrystalline textured Bi Sr CaCu O Bi-2212 and Bi Pb Sr Ca Cu O 2 2 2 8qd 1.84 0.34 1.91 2.03 3.06 10qd Ž . 15 Bi-2223 samples have been carried out. The irradiation induced defect size increases with dose up to 5 = 10 protonsrcm 2 in Bi-2212, but remains effectively constant in Bi-2223 as revealed from positron lifetime measurements. Magnetization studies show that at moderate dose, there is no significant change in intergranular critical current density Ž int . Ž . J in both systems. But intragranular critical current density J increases with dose in Bi-2212. A drastic fall in both c c J int and J is observed at high dose in Bi-2223 as compared to Bi-2212.