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

Research output: Contribution to journalArticle

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

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Critical currents
Multilayer films
insertion
critical current
augmentation
Multilayers
Substrates
Pulsed laser deposition
Thick films
Film thickness
Temperature
laminates
surface temperature
thick films
film thickness
templates
conductors

All Science Journal Classification (ASJC) codes

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

Cite this

Enhancement of critical current in Sm 1+x B 2-x Cu 3 O y multilayer films with the insertion of Sms-rich phase . / Ozaki, Toshinori; Yoshida, Yutaka; Miura, Masashi; Ichino, Yusuke; Takai, Yoshiaki; Matsumoto, Kaname; Ichinose, Ataru; Horii, Shigeru; Mukaida, Masashi.

In: IEEE Transactions on Applied Superconductivity, Vol. 17, No. 2, 01.06.2007, p. 3270-3273.

Research output: Contribution to journalArticle

Ozaki, Toshinori ; Yoshida, Yutaka ; Miura, Masashi ; Ichino, Yusuke ; Takai, Yoshiaki ; Matsumoto, Kaname ; Ichinose, Ataru ; Horii, Shigeru ; Mukaida, Masashi. / Enhancement of critical current in Sm 1+x B 2-x Cu 3 O y multilayer films with the insertion of Sms-rich phase In: IEEE Transactions on Applied Superconductivity. 2007 ; Vol. 17, No. 2. pp. 3270-3273.
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