The study of inter and intragranular pinning behavior of oxygen irradiated textured polycrystalline Bi2Sr2CaCu2O8+delta and Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10+delta superconductors

摘要

Inter and intragranular pinning potentials of 116 MeV oxygen ion irradiated textured polycrystalline Bi2Sr2CaCu2O8+delta (Bi-2212) and Bi1.84Pb0.34Sr1.91Ca2.03Cu3.06O10+delta (Bi-2223) have been studied from do magnetization at low (50 Oe) and high (10,000 Oe) fields respectively. There is an increase in intergranular pinning potential (U-0) in Bi-2223 in contrast to anomalous decreases in Bi-2212 with increasing dislocation density. Intragranular pinning potential is governed by the concentration of vacancy type defects rather than its size as observed in proton irradiation. Pinning has been explained in the light of statistical dilute pinning model. (C) 2004 Elsevier B.V. All rights reserved.