組成を変化させて作製したＭｇＢ２＋Ｘ薄膜の超伝導特性

• 束野 豊

  鹿児島大学工学部

• 土井 俊哉

  鹿児島大学工学部

• 山下 裕生

  鹿児島大学工学部

• 白樂 善則

  鹿児島大学工学部

• 北口 仁

  物質・材料研究機構

• 高橋 健一郎

  物質・材料研究機構

• SOSIATI Harini

  Research Laboratory for High Voltage Electron Microscopy, Kyushu University

• 波多 聰

  九州大学大学院総合理工学研究院

• 池田 賢一

  九州大学大学院総合理工学研究院

• 中島 英治

  九州大学大学院総合理工学研究院

書誌事項

タイトル別名

• Superconducting Properties of MgB2+X Thin Films Prepared with Various Compositions

抄録

In this paper, we examine the superconducting properties of MgB_2+X thin films prepared with various compositions. MgB_2+X thin films were prepared on polished silicon (100) single-crystal substrates using an electron beam evaporation technique without any post-annealing. The critical temperature of the MgB_2+X thin film decreased in accordance with increasing B ratio in the B-rich composition region. However, ⊿Ms in the M-H curves of the B-rich MgB₂ thin films were larger than that of the stoichiometric MgB₂ thin film and the B-rich composition resulted in a longer c-axis length for the MgB₂ crystal. These results suggest that Mg vacancies or B substitution on Mg sites in the MgB_2+X crystals induced by the Mg-deficient composition act as effective pinning centers. Moreover, the chemical composition of the MgB₂ superconductor strongly affected the stability of the microstructure in the MgB₂ thin film. Therefore, we conclude that the slightly B-rich composition is preferable to the stoichiometric composition for the MgB₂ superconductor.

収録刊行物

• 低温工学

  低温工学 43 (11), 482-490, 2008

  公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会)

キーワード

• MgB₂
• thin film
• electron beam evaporation
• composition dependence
• pinning center

詳細情報

• CRID: 1390001204612698240
• NII論文ID: 130004457318
• DOI: 10.2221/jcsj.43.482
• ISSN: 18800408
• ISSN: 03892441
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可