Fabrication of Very Thin High-Temperature-Superconducting Films Required for High-sensitivity Optics/Superconductivity Converters

• Ito Daisuke

  Graduate School of Biology Oriented Science and Technology, Kinki University

• Kotani Katsumi

  Graduate School of Biology Oriented Science and Technology, Kinki University

• Miyake Tomoki

  Graduate School of Biology Oriented Science and Technology, Kinki University

• Nishikawa Hiroaki

  Graduate School of Biology Oriented Science and Technology, Kinki University

• Hontsu Shigeki

  Graduate School of Biology Oriented Science and Technology, Kinki University

• Kusunoki Masanobu

  Graduate School of Biology Oriented Science and Technology, Kinki University

Bibliographic Information

Other Title

• 光/超伝導変換デバイスの感度向上を目的とした極薄高温超伝導膜の作製法の研究
• ヒカリ/チョウデンドウ ヘンカン デバイス ノ カンド コウジョウ オ モクテキ ト シタ ゴクウス コウオン チョウデンドウマク ノ サクセイホウ ノ ケンキュウ

Abstract

We studied a method to obtain superconductivity even in very thin films of YBa₂Cu₃O_y (YBCO). These thinner YBCO films will be able to be applied to optics/superconductivity (opt/super) converters with high optical sensitivity. Opt/super converters composed of YBCO nano-bridges or nano-wires require a low critical current that is determined by the film thickness. According to X-ray diffraction, critical temperature (T_c) and residual resistivity ratio for the substrates of MgO (100), SrTiO₃ (100) and NdGaO₃ (110), superconducting features are influenced by the lattice mismatching layer in YBCO closing to a hetero-epitaxy interface between YBCO and single crystal substrate. YBCO films with different thicknesses varying from 80 to 10nm were prepared on SrTiO₃, using a suitable temperature. The values of T_c slightly decreased when reducing YBCO thickness from 80 to 20 nm, and then declined sharply at less than 20nm. It is considered that a layer in the beginning of deposition less than 20nm causes stress in the crystal lattice. The T_c of 20 nm YBCO film on SrTiO₃ was 80.8 K. It can work above liquid N₂ temperature.

Journal

• IEEJ Transactions on Electronics, Information and Systems

  IEEJ Transactions on Electronics, Information and Systems 132 (11), 1722-1726, 2012

  The Institute of Electrical Engineers of Japan

Keywords

• optics/superconductivity converter
• nano-device
• very thin high-temperature-superconducting film
• lattice mismatching

Details

• CRID: 1390282679585225856
• NII Article ID: 10031120118
• NII Book ID: AN10065950
• DOI: 10.1541/ieejeiss.132.1722
• ISSN: 13488155
• ISSN: 03854221
• NDL BIB ID: 024079313
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024079313
• Web Site: https://www.jstage.jst.go.jp/article/ieejeiss/132/11/132_1722/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed