Electronic structure of aromatic hydrocarbon superconductors studied by photoemission spectroscopies

• Project/Area Number: 24340086
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Okayama University
• Principal Investigator: YOKOYA Takayoshi 岡山大学, 自然科学研究科, 教授 (90311646)
• Co-Investigator(Renkei-kenkyūsha): WAKITA Takanori 岡山大学, 大学院自然科学研究科, 特任講師 (10423279) ; MURAOKA Yuji 岡山大学, 大学院自然科学研究科, 准教授 (10323635)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥14,950,000 (Direct Cost: ¥11,500,000、Indirect Cost: ¥3,450,000); Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000); Fiscal Year 2012: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
• Keywords: 芳香族炭化水素 / 超伝導 / 電子構造 / 光電子分光 / 真空蒸着薄膜 / 薄膜

Outline of Final Research Achievements

Electronic states of potassium (K) doped picene have been studied by photoemission spectroscopies. Resistivity and GIXD measurements have been also performed on picene films synthesized under ultrahigh vacuum. Photoemission studies on K evaporated picene films showed appearance and disappearance of Fermi edge as a function of K concentration, suggesting the metallic nature of the picene film with certine K concentration. Resistivity change as a function of evaporation time shows characteristic two-peak structure, indicating K doping into a pristine picene film. GIXD studies indicate that picene films with different orientations can grow depending on the substrates.

Research Products

• [Journal Article] Superconductivity in aromatic hydrocarbons (2015)
  • Author(s): Yoshihiro Kubozono, Hidenori Goto, Taihei Jabuchi, Takayoshi Yokoya, Takashi Kambe, Yusuke Sakai, Masanari Izumi, Lu Zheng, Shino Hamao, Huyen L.T. Nguyen, Masafumi Sakata, Tomoko Kagayama, Katsuya Shimizu
  • Journal Title: Physica C: Superconductivity and its Applications Volume: in press Pages: 199-2015
  • DOI: 10.1016/j.physc.2015.02.015
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Evidence for metallic states in pottasium-intercalated picene film on graphite (2013)
  • Author(s): H.Okazaki, T. Jabuchi, T. Wakita, T. Kato, Y. Muraoka, T. Yokoya
  • Journal Title: Phys. Rev. B Volume: 88 Issue: 24 Pages: 245414-245414
  • DOI: 10.1103/physrevb.88.245414
  • Peer Reviewed
• [Presentation] 低温で作製したKドープピセン真空蒸着膜の電気抵抗測定 (2015)
  • Author(s): 濵田貴裕，蛇渕泰平，脇田高徳，村岡祐治，横谷尚睦
  • Organizer: 日本物理学会第70回年次大会（3/21-24）
  • Place of Presentation: 早稲田大学早稲田キャンパス(東京都)
  • Year and Date: 2015-03-22
• [Presentation] Doping dependent electronic properties of doped picene film (2015)
  • Author(s): T. Hamada, T. Jabuchi, T. Wakita, Y. Muraoka, T. Yokoya
  • Organizer: The19th Hiroshima International Symposium on Synchrotron Radiation(3/5-6)
  • Place of Presentation: Hiroshima Synchrotron Radiation Center, Hiroshima University
  • Year and Date: 2015-03-05
• [Presentation] Kドープピセン真空蒸着膜の電気抵抗測定 (2014)
  • Author(s): 濱田貴裕，蛇渕泰平，岡崎宏之，脇田高徳，神戸高志，後藤秀徳，久保園芳博， 村岡祐治，横谷尚睦
  • Organizer: 日本物理学会 2014年秋季大会
  • Place of Presentation: 中部大学 春日井キャンパス(名古屋)
  • Year and Date: 2014-09-09
• [Presentation] ドープ芳香族炭化水素超伝導体の電子状態 (2013)
  • Author(s): 蛇渕泰平, 他
  • Organizer: 日本物理学会2013年春季大会
  • Place of Presentation: 広島大学東広島キャンパス
  • Year and Date: 2013-03-26
• [Presentation] K doping dependent electronic structure of picene films studied by high-resolution photoemission spectroscopy . (2012)
  • Author(s): T. Jabuchi, et al.
  • Organizer: International Symposium on Physics and Chemistry of Novel Superconductors and Related Materials 。
  • Place of Presentation: Faculty of Science, Okayama University, Okayama, Japan
  • Year and Date: 2012-10-02
• [Presentation] 高分解能光電子分光によるピセン薄膜の電子状態のKドープ依存性 (2012)
  • Author(s): 蛇渕泰平, 他
  • Organizer: 日本物理学会2012年秋季大会
  • Place of Presentation: 横浜国立大学常盤台キャンパス
  • Year and Date: 2012-09-19
• [Presentation] High-resolution photoemission study of K doped picene film
  • Author(s): Takayoshi Yokoya
  • Organizer: Workshop on Superconductivity and Magnetism associated with Geometry and Dimensionality from Organics to Inorganics (SuMO2013)
  • Place of Presentation: 東北大学原子分子材料科学高等研究機構（AIMR）（宮城）
  • Invited
• [Presentation] Electronic structure of K doped picene film studied by-high-resolution photoemission spectroscopy
  • Author(s): Takayoshi Yokoya
  • Organizer: LEMSUPER CONFERENCE (9/24-26)
  • Place of Presentation: International Center for Theoretical Physics (Trieste,Italy)
  • Invited
• [Presentation] Kドープピセン膜の伝導性および電子状態
  • Author(s): 蛇渕泰平，脇田高徳，大塚翼，加藤貴，久保園芳博，神戸高志，村岡祐治，横谷尚睦
  • Organizer: 日本物理学会2013年秋季大会
  • Place of Presentation: 徳島大学常三島キャンパス（徳島）
• [Presentation] High-resolution PES of K doped picene film
  • Author(s): T. Yokoya, H. Okazaki, T. Jabuchi, T. Wakita, T. Kato, Y. Kubozono, T. Kambe, Y. Muraoka
  • Organizer: International Workshop on Interface for Novel Physical Properties and Electronics
  • Place of Presentation: Research Laboratory for Surface Science, Okayama University,