Effect of Sm/Ba substitution on the Jc in magnetic field of SmBCO thin films by low temperature growth technique

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

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28 Citations (Scopus)

Abstract

We have reported superconducting properties of Sm1+xBa 2-xCu3Oy (SmBCO; x = 0.08) thin films prepared by the low temperature growth technique (LTG). LTG process is consisted of two steps as follows; a seed layer is deposited at 830°C on MgO(100), and then upper layer is deposited at 740-780°C on the seed layer. In order to investigate the effect of the fluctuations Sm/Ba composition ratio in the SmBCO matrix, we deposited upper layer with the Sm/Ba composition of x = 0 - 0.12. The SmBCO films with x = 0.04 and 0.08 show critical current density (J c) at 77 K of up to 5 × 106 A/cm2 under 0 T and 1 × 105 A/cm2 under 5 T for B//c at 77 K, respectively. The Jc of x = 0.12 film dropped more sharply compared with the cases of x = 0.04 and 0.08 films. From the microstructure analysis, it was found that the main phase of x = 0.12 film was Sm-rich (Sn 1.1Ba1.9Cu3Oy) phase, while that of x = 0.04 and 0.08 films was stoichiometry. We speculated that the low-J c of x = 0.12 film in the magnetic fields was ascribed to the low physical meters of Tc and irreversibility field of the Sm-rich SmBCO main phase.

Original languageEnglish
Pages (from-to)3078-3081
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume15
Issue number2 PART III
DOIs
Publication statusPublished - Jun 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

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

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