Orientation and Crystal Growth Mode in Sm1+xBa2-xCu3Oy Films Prepared by a Low Temperature Growth Technique

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  • MIURA Masashi
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • YOSHIDA Yutaka
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • ICHINO Yusuke
    Dept. of Electrical Engineering and Computer Science, Nagoya University CREST-Japan Science and Technology Agency
  • TAKAI Yoshiaki
    Dept. of Electrical Engineering and Computer Science, Nagoya University
  • MATSUMOTO Kaname
    Dept. of Materials Science, Kyoto University CREST-Japan Science and Technology Agency
  • ICHINOSE Ataru
    Electroc Power Enginnering Research Lab., Central Research Central Resaerch Institute of Electric Power Industry CREST-Japan Science and Technology Agency
  • HORII Shigeru
    Dept. of Applied chemistry, University of Tokyo CREST-Japan Science and Technology Agency
  • MUKAIDA Masashi
    Dept. of Materials Science and Engineering, Kyushu University CREST-Japan Science and Technology Agency

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Other Title
  • ＬＴＧ法を用いて作製したＳｍ１＋ｘＢａ２－ｘＣｕ３Ｏｙ薄膜の配向性と成長様式
  • LTGホウ オ モチイテ サクセイシタ Sm1xBa2xCu3Oy ハクマク ノ ハイコウセイ ト セイチョウ ヨウシキ

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Abstract

We have reported high-Jc Sm1+xBa2-xCu3Oy (SmBCO) films prepared by a low-temperature growth (LTG) technique. Despite the low-substrate temperature, the LTG-SmBCO films showed complete c-axis orientation and cube-on-cube texture. In addition, the LTG-SmBCO films showed a Jc of 0.28 MA/cm2 (77 K, B//c, B=5 T), because these included high-dislocation densities and nanosize low-Tc particles. In this study, we discuss the mechanism of c-axis orientation and crystal growth for high-Jc LTG-SmBCO films. We newly suggest a model for “Nucleated growth on c-axis oriented Seed layer (NCS)" to understand the c-axis orientation mechanism for LTG-SmBCO films. Based on the NCS model, when the LTG-SmBCO films nucleated on a seed layer have two-dimensional (2D) nuclei with a 1 unit SmBCO step cell height, the interfacial energy between the nucleus and the seed layer and the critical Gibbs free energy of the nucleus are lower than those of PLD-SmBCO films. Therefore, the LTG-SmBCO films show high crystal quality and a wide processing window for biaxial orientation. We suggest that the LTG technique is effective for not only increasing Jc in magnetic fields, but also improving the processing window and crystal quality.

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