Structural and Superconducting Properties of Magnetically Doped Bi-2212

Abstract

In this work, we have applied the laser floating zone technique, a well-known method to produce highly aligned crystals and dense morphology, with improved transport properties, to obtain Bi2Sr2Ca1Cu2-x Ni (x) O (x=0, 0.01, 0.03, 0.05 and 0.1) fibers of about 1.8 mm diameter x12 cm length. Microstructural and magnetic properties of textured materials grown in the optimum conditions were analyzed through scanning electron microscope (SEM), energy dispersive X-ray analysis (EDX), powder XRD patterns, M-T and M-H loops. XRD analysis showed that addition of Ni at x=0.1 level caused the formation of small amounts of Bi-2201 phase. Thermal treatment has produced the agglomeration of Ni particles up to a few mu m, detected by dot mapping EDX. Both T (c-onset) and J (cmag) values of the annealed rods decreased with the increasing Ni substitution rate, determined from the M-T and M-H loops, respectively.

C1 [Yakinci, M. E.; Ozabaci, M.] Inonu Univ, SEM EDX Lab, Bilimsel & Teknol Arastirma Merkezi IBTAM, TR-44280 Malatya, Turkey.

[Yakinci, M. E.] Inonu Univ, Fen Edebiyat Fak, Fiz Bolumu, TR-44280 Malatya, Turkey.

[Madre, M. A.; Sotelo, A.] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon ICMA, Zaragoza 50018, Spain.