Jc of Sm1+xBa2−xCu3Oy films improved in the whole angle range by introducing BaZrO3 nanoparticles

✍ Scribed by T. Harada; Y. Yoshida; Y. Ichino; T. Ozaki; Y. Takai; K. Matsumoto; A. Ichinose; S. Horii; M. Mukaida; R. Kita

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 953 KB
• Volume: 469
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2009.05.247

✦ Synopsis

For an enhancement of J c under applied magnetic fields, introducing BaZrO 3 (BZO) into REBa 2 Cu 3 O y (REBCO) is effective. However, there have been few reports on the comparison of configurational effect of BZO on the crystallinity, superconducting properties and microstructures in REBCO films. In this study, we fabricated 2 vol.% BZO-doped Sm 1+x Ba 2Àx Cu 3 O y (SmBCO) films by pulsed laser deposition with two different methods during deposition; using BZO-doped SmBCO target (BZO-mixed SmBCO), and alternating SmBCO and BZO targets (BZO-layered SmBCO). The angular dependence of J c (77 K, B = 1 T) in the BZO-mixed SmBCO film exhibited strong peak in the direction parallel to the c-axis, while the J c of the BZO-layered SmBCO film was enhanced in the whole field angle range. From a microstructure analysis, nanosized BZO-particles were observed in the BZO-layered SmBCO film and they acted as isotropic pinning centers.