Enhancement of critical current in Sm 1+x B 2-x Cu 3 O y multilayer films with the insertion of Sms-rich phase

Toshinori Ozaki, Yutaka Yoshida, Masashi Miura, Yusuke Ichino, Yoshiaki Takai, Kaname Matsumoto, Ataru Ichinose, Shigeru Horii, Masashi Mukaida

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1 Citation (Scopus)

Abstract

Coated conductors for power applications require REBCO films with high critical currents (I c ). However, REBCO thick films were likely to be a-axis oriented so that I c was saturated with increasing the film thickness. Previously we reported that Sm-rich (Sm 1+x Ba 2-x Cu 3 O y ; x = 0.08) films grown at low deposition temperatures on MgO substrates showed the complete c-axis orientation and the large terrace width as compared with SmBCO (Sm 1+x Ba 2-x Cu 3 O y ; x = 0.04) films. In this study, we will propose a novel multilayer technique in order to suppress the a-axis growth and keep large terrace width. In this technique thin Sm-rich layers are inserted among SmBCO layers. The multilayer structures [Sm - rich/SmBCO] * N (N = 1, 2, 3, ⋯) was fabricated by PLD method on MgO substrates. Although I c in the SmBCO single layer films at 77 K was saturated at about 350 A/cm-width over the thickness of about 1.3 μm, the SmBCO multilayer films with a thickness of 1.7 μm showed the complete c-axis orientation, and the I c achieved about 800 A/cm-width at 77 K. We confirmed that the growth of the a-axis oriented regions was suppressed by the Sm-rich layers. It is considered that the Sm-rich layers act as a template layer for maintaining the c-axis orientation, even though the surface temperature decreased with the thickness.

Original languageEnglish
Pages (from-to)3270-3273
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume17
Issue number2
DOIs
Publication statusPublished - Jun 1 2007

All Science Journal Classification (ASJC) codes

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

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