Flux pinning characteristics of Smi+xBa2-xCu 3Oy films with the additional c-axis correlated pinning centers

Toshinori Ozaki, Yutaka Yoshida, Yusuke Ichino, Takahiro Harada, Yoshiaki Takai, Kaname Matsumoto, Ataru Ichinose, Shigeru Horii, Masashi Mukaida, Ryusuke Kita

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It is known that columnar defects comprised of self-organized BaZrO 3 (BZO) nanorods within REBa2Cu3Oy (REBCO) films are attractive as c-axis correlated pinning centers. On the other hand, we have fabricated high-Jc Sm1+xBa 2-aCu3Oy (SmBCO) films including nanosized low-Tc phases by using the low-temperature growth (LTG) technique. In this study, BZO nanorods were added to the LTG-SmBCO film for a further enhancement of the magnetic flux pinning. Additionally, we also deposited a conventional PLD-SmBCO film including BZO nanorods and discussed differences of the flux pinning properties and microstructures between LTG- and PLD-SmBCO films. In a cross-sectional transmission electron microscopy (TEM) image of the BZO doped PLD-SmBCO film, we could see the self-organized BZO nanorods were about 10 nm in diameter, extending along the c-axis of the film. In contrast, in the BZO doped LTG-SmBCO film, the high density BZO nanorods with smaller diameters tended to be short columns and tilted against the c-axis direction. These facts can be attributed to a suppression of the surface diffusion length of adatoms and/or an increase of nucleation frequency due to the low substrate temperature during the growth of the BZO doped LTG-SmBCO film. Furthermore, we concluded that differences of superconducting properties between the BZO doped PLD- and LTG-SmBCO films might be attributed to the difference in the number density of BZO nanorods which generated lattice strain around them.

Original languageEnglish
Article number4967842
Pages (from-to)3507-3510
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number3
Publication statusPublished - Jun 1 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Ozaki, T., Yoshida, Y., Ichino, Y., Harada, T., Takai, Y., Matsumoto, K., Ichinose, A., Horii, S., Mukaida, M., & Kita, R. (2009). Flux pinning characteristics of Smi+xBa2-xCu 3Oy films with the additional c-axis correlated pinning centers. IEEE Transactions on Applied Superconductivity, 19(3), 3507-3510. [4967842]. https://doi.org/10.1109/TASC.2009.2018456