Electronic Spectroscopy in Superconducting Diamond: Superconductivity and Disorder Effect near the Insulator Transition

• Project/Area Number: 22540360
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Tohoku University
• Principal Investigator: NISHIZAKI Terukazu 東北大学, 金属材料研究所, 助教 (90261510)
• Co-Investigator(Renkei-kenkyūsha): TAKANO Yoshihiko 独立行政法人物質・材料研究機構, 超伝導 材料研究センター, グループリーダー (10354341)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000); Fiscal Year 2011: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2010: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 超伝導材料 / 低温物性 / 走査プローブ顕微鏡 / 物性実験 / ボロンドープダイヤモンド / 超伝導 / 走査トンネル顕微鏡 / トンネル分光 / ナノ電子状態 / 渦糸状態

Research Abstract

We have performed electronic spectroscopy and observed superconducting electronic states in boron-doped diamond by using scanning tunneling microscope in order to study the effect of the disorder on the superconductivity near the metal-insulator transition. We have observed the boron concentration dependence of the tunneling spectra and the spatial variation of the local density of states. The results indicate that the boron doping enhances not only the carrier concentration but also the disorder density.

Research Products

• [Journal Article] Spatial Variation of Tunneling Spectra in (111)-Oriented Films of Boron-Doped Diamond Probed by STM/STS (2013)
  • Author(s): T. Nishizaki, Y. Takano, M. Nagao, H. Kawarada, T. Sasaki, and N. Kobayashi
  • Journal Title: Int. J. Mod. Phys. B Volume: 27 Issue: 15 Pages: 1362014-1362014
  • DOI: 10.1142/s0217979213620142
  • Peer Reviewed
• [Journal Article] Superconducting Properties in Bulknanostructured Niobium Prepared by High-Pressure Torsion (2013)
  • Author(s): T. Nishizaki, S. Lee, Z. Horita, T. Sasaki, and N. Kobayashi
  • Journal Title: Physica C Volume: (印刷中) Pages: 132-135
  • DOI: 10.1016/j.physc.2013.03.046
  • Peer Reviewed
• [Journal Article] Spatial Variation of Tunneling Spectra in (111)-Oriented Films of Boron-Doped Diamond Probed by STM/STS (2013)
  • Author(s): T. Nishizaki
  • Journal Title: Int. J. Mod. Phys. B Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Superconducting Properties in Bulknanostructured Niobium Prepared by High-Pressure Torsion (2013)
  • Author(s): T. Nishizaki
  • Journal Title: Physica C Volume: 印刷中
  • Peer Reviewed
• [Journal Article] Surface Structure andSuperconductivity in Ba(Fe0.93Co0.07)2As2Probed by Scanning Tunneling Microscopy /Spectroscopy (2011)
  • Author(s): T. Nishizaki, Y. Nakajima, T. Tamegai, and N. Kobayashi
  • Journal Title: J. Phys. Soc. Jpn Volume: 80 Issue: 1 Pages: 14710-14710
  • DOI: 10.1143/jpsj.80.014710
  • Peer Reviewed
• [Journal Article] Scanning Tunneling Microscopy/Spectroscopy in Iron-Pnictide Superconductor (2010)
  • Author(s): T. Nishizaki, Y. Nakajima, T. Tamegai, and N. Kobayashi
  • Journal Title: Physica C Volume: 470 Pages: S342-S343
  • DOI: 10.1016/j.physc.2009.10.112
  • Peer Reviewed
• [Journal Article] STM/STS Studies on the Energy Gap ofPb-Substituted Bi_2Sr_2CuO_<6+d> in Magnetic Fields (2010)
  • Author(s): K. Kudo, T. Nishizaki, D. Okamoto, N. Okumura, and N. Kobayashi
  • Journal Title: Physica C Volume: 470 Pages: S195-S196
  • DOI: 10.1016/j.physc.2009.10.047
  • Peer Reviewed
• [Journal Article] Local Spectroscopy and Vortex-Core Imaging on ChemicallyWet-Etched Surfaces of YBa2Cu3Oy by Scanning Tunneling Microscopy/ Spectroscopy (2010)
  • Author(s): K. Shibata, T. Nishizaki, M. Maki, and N. Kobayashi
  • Journal Title: Supercond. Sci. Technol Volume: 23 Issue: 8 Pages: 85004-85004
  • DOI: 10.1088/0953-2048/23/8/085004
  • Peer Reviewed
• [Presentation] 微細結晶粒を持つナノ構造体における超伝導特性 (2013)
  • Author(s): 西嵜照和,李昇原,堀田善治,佐々木孝彦,小林典男
  • Organizer: 日本物理学会第68回年次大会
  • Place of Presentation: 広島大学東広島キャンパス,東広島市
• [Presentation] バルクナノメタルの超伝導:微細結晶粒を持つナノ構造体の超伝導特性と超伝導材料開発へのインパクト (2013)
  • Author(s): 西嵜照和,李昇原,堀田善治,佐々木孝彦,小林典男
  • Organizer: 金属材料研究所共同利用研究会「ナノ構造超伝導体の磁束構造」
  • Place of Presentation: 仙台市
• [Presentation] バルクナノメタルの超伝導： 微細結晶粒を持つナノ構造体の超伝導特性と (2013)
  • Author(s): 西嵜照和
  • Organizer: 金属材料研究所共同利用研究会「ナノ構造超伝導体の磁束構造」
  • Place of Presentation: 仙台市
  • Invited
• [Presentation] 微細結晶粒を持つナノ構造体における超伝導特性 (2013)
  • Author(s): 西嵜照和
  • Organizer: 日本物理学会 第68回年次大会
  • Place of Presentation: 東広島市
• [Presentation] Enhancement of the Upper Critical Field in Bulk Nanostructured Niobium Processed by High-Pressure Torsion (2012)
  • Author(s): T. Nishizaki, S. Lee, Z. Horita, T. Sasaki, and N. Kobayashi
  • Organizer: Summit of Material Science 2012 (SMS2012)
  • Place of Presentation: Sendai, Japan
• [Presentation] Spatial Variation of Tunneling Spectra in (111)-Oriented Films of Boron-Doped Diamond Probedby STM/STS, Ninth International Conference on New Theories (2012)
  • Author(s): T. Nishizaki, Y. Takano, M. Nagao, T. Takenouchi, H. Kawarada, T. Sasaki, and N. Kobayashi
  • Organizer: Discoveries and Applications of Superconductors and Related Materials (New3SC-9)
  • Place of Presentation: Frascati, Rome, Italy
• [Presentation] Superconductivity in Bulk Nanostructured Niobium Prepared by High-Pressure Torsion, Ninth International Conference on New Theories (2012)
  • Author(s): T. Nishizaki, S. Lee, Z. Horita, T. Sasaki, and N. Kobayashi
  • Organizer: Discoveries and Applications of Superconductors and Related Materials (New3SC-9)
  • Place of Presentation: Frascati, Rome, Italy
• [Presentation] STM Studies on SurfaceAtomic Structure and Vortex Imaging inBa(Fe_<0.93>Co_<0.07>)_2As_2 (2012)
  • Author(s): T. Nishizaki
  • Organizer: InternationalWorkshop on Pathbreaking Phase Science in Superconductivity 2012 (PPSS2012)
  • Place of Presentation: Osaka, Japan
• [Presentation] Spatial Variation of Tunneling Spectra in (111)-Oriented Films of Boron-Doped Diamond Probed by STM/STS (2012)
  • Author(s): T. Nishizaki
  • Organizer: Ninth International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials (New3SC-9)
  • Place of Presentation: Frascati, Rome, Italy
• [Presentation] Superconductivity in Bulk Nanostructured Niobium Prepared by High-Pressure Torsion (2012)
  • Author(s): T. Nishizaki
  • Organizer: Ninth International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials (New3SC-9)
  • Place of Presentation: Frascati, Rome, Italy
  • Invited
• [Presentation] バルクナノメタルの超伝導特性 (2011)
  • Author(s): 西嵜照和
  • Organizer: 第19回渦糸物理国内会議
  • Place of Presentation: 物質・材料研究機構
  • Year and Date: 2011-12-07
• [Presentation] 鉄砒素系超伝導体Ba(Fe_<0.93>Co_<0.07>)_2As_2単結晶における磁場中走査トンネル顕微/分光 (2011)
  • Author(s): 西嵜照和
  • Organizer: 日本物理学会2011年秋季大会
  • Place of Presentation: 富山大学五福キャンパス
  • Year and Date: 2011-09-22
• [Presentation] バルクナノメタルの超伝導特性 (2011)
  • Author(s): 西嵜照和,李昇原,堀田善治,小林典男
  • Organizer: 第19回渦糸物理国内会議,物質・材料研究機構(並木地区)
  • Place of Presentation: つくば市
• [Presentation] Scanning TunnelingMicroscopy/Spectroscopy in Iron-PnictideSuperconductor Ba(Fe_<0.93>Co_<0.07>)_2As_2 (2011)
  • Author(s): T. Nishizaki
  • Organizer: 13th International Workshop on VortexMatter in Superconductors
  • Place of Presentation: Chicago, Illinois, USA
• [Presentation] 大型実験施設の強磁場マグネットを用いた走査トンネル顕微鏡の開発 (2010)
  • Author(s): 西嵜照和
  • Organizer: 第18回渦糸物理国内会議
  • Place of Presentation: 日本原子力研究開発機構システム計算科学センター
  • Year and Date: 2010-12-01
• [Presentation] Pb置換Bi2201単結晶における変調構造のPb量依存性と渦糸状態 (2010)
  • Author(s): 西嵜照和
  • Organizer: 日本物理学会2010年秋季大会
  • Place of Presentation: 大阪府立大学中百舌鳥キャンパス
  • Year and Date: 2010-09-23
• [Presentation] ハイブリッドマグネットを用いた強磁場STMの開発 (2010)
  • Author(s): 西嵜照和
  • Organizer: 第119回金属材料研究所講演会
  • Place of Presentation: 東北大学金属材料研究所
  • Year and Date: 2010-05-27