Electronic structure of new BiS2 based layered superconductor studied by multi-mode photoemission spectroscopy

• Project/Area Number: 15H03691
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Okayama University
• Principal Investigator: Yokoya Takayoshi 岡山大学, 異分野基礎科学研究所, 教授 (90311646)
• Co-Investigator(Renkei-kenkyūsha): TERASHIMA KENSEI 岡山大学, 異分野基礎科学研究所, 特任講師 (20551518) ; WAKITA TAKANORI 岡山大学, 異分野基礎科学研究所, 特任講師 (10423279)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥15,340,000 (Direct Cost: ¥11,800,000、Indirect Cost: ¥3,540,000); Fiscal Year 2017: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2016: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2015: ¥7,280,000 (Direct Cost: ¥5,600,000、Indirect Cost: ¥1,680,000)
• Keywords: BiS系超伝導体 / 電子状態 / 光電子分光 / BiS2系超伝導体

Outline of Final Research Achievements

We have performed photoemission spectroscopy with several modes of REO1-xFxBiS2 (RE=Rare Earth) in order to elucidate mechanism of superconductivity of BiS2 based layered superconductors. From the direct measurement of Fermi surface and band structure using ultraviolet ARPES on LaO1-xFxBiS2(x=0.23,0.5), we have elucidated close correlation between density of states at the Fermi level and Tc. From soft x-ray resonant photoemission spectroscopy of CeO1-xFxBiS2, where coexistence of superconductivity and magnetism has been reported, we have revealed that Ce 4f electrons do not play major role in the electron conduction. We also obtained other results. These results are crucial for understanding the mechanism of the superconductivity of BiS2 based layered superconductors

Research Products

• [Int'l Joint Research] ローマ大学サピエンザ校/ELETTRA放射光施設/Lab. TASC(イタリア)
• [Int'l Joint Research] Recep Tayyip Erdogan Univ.(トルコ)
• [Int'l Joint Research] Univ. Johannesburg(南アフリカ)
• [Int'l Joint Research] ローマ大学サピエンザ校(イタリア)
• [Journal Article] Metallic phase in stoichiometric CeOBiS2 revealed by space-resolved ARPES (2018)
  • Author(s): Sugimoto T.、Paris E.、Wakita T.、Terashima K.、Yokoya T.、Barinov A.、Kajitani J.、Higashinaka R.、Matsuda T. D.、Aoki Y.、Mizokawa T.、Saini N. L.
  • Journal Title: Scientific Reports Volume: 8 Issue: 1 Pages: 2011-2011
  • DOI: 10.1038/s41598-018-20351-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Electronic structure of Ag1-xSn1+xSe2 (x = 0.0, 0.1, 0.2, 0.25 and 1.0) (2017)
  • Author(s): T. Wakita, E. Paris, K. Kobayashi, K. Terashima, M. Y. Hacisalihoglu, T. Ueno, F. Bondino, E. Magnano, I. Pis, L. Olivi, J. Akimitsu, Y. Muraoka, T. Yokoya, and N. L. Saini
  • Journal Title: Phys. Chem. Chem. Phys. Volume: 19 Issue: 39 Pages: 26672-26678
  • DOI: 10.1039/c7cp05369j
  • NAID: 130007646621
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Direct observation of double valence-band extrema and anisotropic effective masses of the thermoelectric material SnSe (2017)
  • Author(s): Takanobu Nagayama, Kensei Terashima, Takanori Wakita, Hirokazu Fujiwara, Tetsushi Fukura, Yuko Yano, Kanta Ono, Hiroshi Kumigashira, Osamu Ogiso, Aichi Yamashita, Yoshihiko Takano, Hitoshi Mori, Hidetomo Usui, Masayuki Ochi, Kazuhiko Kuroki, Yuji Muraoka, Takayoshi Yokoya
  • Journal Title: Japanese Journal of Applied Physics Volume: 57 Issue: 1 Pages: 010301-010301
  • DOI: 10.7567/jjap.57.010301
  • NAID: 210000148501
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Ce 4f electronic states of CeO1-xFxBiS2 studied by soft x-ray photoemission spectroscopy (2017)
  • Author(s): T. Wakita, K. Terashima, T. Hamada, H. Fujiwara, M. Minohara, M. Kobayashi, K. Horiba, H. Kumigashira, G. Kutluk, M. Nagao, S. Watauchi, I. Tanaka, S. Demura, H. Okazaki, Y. Takano, Y. Mizuguchi, O. Miura, K. Okada, Y. Muraoka, T. Yokoya
  • Journal Title: Physical Review B Volume: 95 Issue: 8 Pages: 085109-085109
  • DOI: 10.1103/physrevb.95.085109
  • NAID: 120006377702
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Evolution of Eu valence and superconductivity in layered Eu0.5La0.5FBiS2-xSex system (2017)
  • Author(s): Y. Mizuguchi, E. Paris, T. Wakita, G. Jinno, A. Puri, K. Terashima, B. Joseph, O. Miura, T. Yokoya, N. L. Saini
  • Journal Title: Phys. Rev. B Volume: 95 Issue: 6 Pages: 064515-064515
  • DOI: 10.1103/physrevb.95.064515
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Determination of the local structure of CsBi4-xPbxTe6 (x=0, 0.5) by X-ray absorption spectroscopy (2016)
  • Author(s): T. Wakita, E. Paris, M. Y. Hacisalihoglu, K. Terashima, H. Okazaki, O. Proux, I. Kieffer, E. Lahera, W. Del Net, L. Olivi, Y. Takano, Y. Muraoka, T. Yokoya, N. L. Saini
  • Journal Title: Physical Chemistry Chemical Physics Volume: 18 Issue: 36 Pages: 25136-25142
  • DOI: 10.1039/c6cp04949d
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Comparative ARPES studies of LaOxF1-xBiS2 (x= 0.23 and 0.46) (2016)
  • Author(s): K. Terashima, T. Wakita, M. Sunagawa, H. Fujiwara, T. Nagayama, K. Ono, H. Kumigashira, M. Nagao, S. Watauchi, I. Tanaka, H. Okazaki, Y. Takano, Y. Mizuguchi, H. Usui, K. Kuroki, Y. Muraoka, T. Yokoya
  • Journal Title: J. Phys.: Conf. Ser. Volume: 683 Pages: 012002-012002
  • DOI: 10.1088/1742-6596/683/1/012002
  • Peer Reviewed / Open Access
• [Journal Article] Bulk sensitive angle-resolved photoelectron spectroscopy on Nd(O,F)BiS2 (2016)
  • Author(s): K. Terashima, J. Sonoyama, M. Sunagawa, H. Fujiwara, T. Nagayama, T. Muro, M. Nagao, S. Watauchi, I. Tanaka, H. Okazaki, Y. Takano, Y. Mizuguchi, H. Usui, K. Suzuki, K. Kuroki, T. Wakita, Y. Muraoka, T. Yokoya
  • Journal Title: J. Phys.: Conf. Ser. Volume: 683 Pages: 012003-012003
  • DOI: 10.1088/1742-6596/683/1/012003
  • Peer Reviewed / Open Access
• [Presentation] Ag1-xSn1+xSe2 (x = 0.0, 0.1, 0.2, 0.25 及び1.0)の電子状態 (2018)
  • Author(s): 脇田高徳, E. Paris, 小林夏野, 寺嶋健成, M. Y. Hacisalioglu, 上野哲平, F. Bondino, E. Magnano, I. Pis, L. Olivi, 秋光純, 村岡祐治, 横谷尚睦, N. L. Saini
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Combined study of XAFS and PES for novel superconductors: local structure and electronic states of CsBi4-xPbxTe6 and CeO1-xFxBiS2 (2017)
  • Author(s): T. Wakita, K. Terashima, Y. Muraoka, T. Yokoya, and N. L. Saini
  • Organizer: Physics and Chemistry of Superconductors and Thermoelectric Materials
  • Int'l Joint Research
• [Presentation] Ce 4f electronic states of CeO1－xFxBiS2 studied by soft x-ray photoemission spectroscopy (2017)
  • Author(s): T. Wakita, K. Terashima, T. Hamada, H. Fujiwara, M. Minohara, M. Kobayashi, K. Horiba, H. Kumigashira, G. Kutluk, M. Nagao, S. Watauchi, I. Tanaka, S. Demura, H. Okazaki, Y. Takano, Y. Mizuguchi, O. Miura, K. Okada, Y. Muraoka, and T. Yokoya
  • Organizer: European Materials Research Society (E-MRS) 2017 Fall meeting
  • Int'l Joint Research
• [Presentation] 光電子分光を用いたLaOBiS2-xSex(x = 0.0, 1.0)の電子状態の研究 (2017)
  • Author(s): 矢野佑幸, 寺嶋健成, 脇田高徳, 水口佳一, 村岡祐治, 横谷尚睦
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Photoemission study of LaOBiS2 and LaOBiSSe (2016)
  • Author(s): Yuko Yano, Kensei Terashima, Yoshikazu Mizuguchi, Akira Miura, Takanori Wakita, Yuji Muraoka, Takayoshi Yokoya
  • Organizer: International Workshop on Superconductivity and Related Functional Materials 2016
  • Place of Presentation: National Institute for Materials Science (NIMS)
  • Year and Date: 2016-12-20
  • Int'l Joint Research
• [Presentation] Ce 4f electronic states of CeO1-xFxBiS2 studied by SX-PES and XAS (2016)
  • Author(s): T. Wakita, K. Terashima, T. Hamada, H. Fujiwara, M. Minohara, M. Kobayashi, K. Horiba, H. Kumigashira, G. Kutluk, M. Nagao, S. Watauchi, I. Tanakae S. Demura, H. Okazaki, Y. Takano, Y. Mizuguchi, O. Miura, K. Okada, Y. Muraoka, T. Yokoya
  • Organizer: 第20回広島放射光国際シンポジウム
  • Place of Presentation: 広島大学東広島キャンパス（東広島）
  • Year and Date: 2016-03-16
  • Int'l Joint Research
• [Presentation] Photoemission studies on novel superconductors (2016)
  • Author(s): T. Yokoya, K. Terashima, T. Wakita, Y. Muraoka
  • Organizer: The kick-off meeting of the JSPS project "Development of international research network aiming for the realization of superconductive materials with high critical temperature
  • Place of Presentation: Okayama University
  • Year and Date: 2016-02-29
  • Int'l Joint Research
• [Presentation] 新規超伝導体の電子状態研究と光電子分光 (2016)
  • Author(s): 横谷尚睦
  • Organizer: 平成27年度コミュニケーション事業「室温超伝導体を目指す物質調査」
  • Place of Presentation: 蔵王センタープラザ（山形）
  • Year and Date: 2016-01-25
  • Invited
• [Presentation] 角度分解光電子分光による新規超伝導の機構解明 (2016)
  • Author(s): 横谷尚睦
  • Organizer: 第29回日本放射光学会年会 放射光科学合同シンポジウムJSR2016
  • Place of Presentation: 東京大学柏の葉キャンパス駅前サテライト（千葉）
  • Year and Date: 2016-01-11
  • Invited
• [Presentation] 新規層状超伝導体CsBi4-xPbxTe6の光電子分光 (2016)
  • Author(s): 岡崎宏之, 濱田貴裕, 寺嶋健成, 脇田高徳, 溝川貴司, E. Paris, M. Y. Hacisalihoglu, O. Proux, I. Kieffer, E. Lahera, W.D. Net, L. Olivi, 岩田啓嗣, 田中将嗣, 高野義彦, 村岡祐治, N.L. Saini, 横谷尚睦
  • Organizer: 日本物理学会2016年秋季大会
  • Place of Presentation: 金沢大学角間キャンパス
• [Presentation] Determination of the local structure of CsBi4-xPbxTe6 (x=0, 0.5) by x-ray absorption spectroscopy (2016)
  • Author(s): T. Wakita
  • Organizer: European Materials Research Society (E-MRS) 2016 Fall meeting
  • Place of Presentation: Warsaw University of Technology
  • Int'l Joint Research / Invited
• [Presentation] Electronic structure of BiS2-based superconductors studied by photoemission spectroscopies (2015)
  • Author(s): T. Yokoya
  • Organizer: TMU International Symposium on “New Quantum Phases Emerging from Novel Crystal Structure”
  • Place of Presentation: Minami-Osawa Campus, Tokyo Metropolitan University
  • Year and Date: 2015-09-24
  • Int'l Joint Research / Invited
• [Presentation] ARPES study on La(O,F)BiS2 using VUV and soft x-ray photons (2015)
  • Author(s): K. Terashima
  • Organizer: TU International Symposium on “New Quantum Phases Emerging from Novel Crystal Structure”
  • Place of Presentation: Minami-Osawa Campus, Tokyo Metropolitan University
  • Year and Date: 2015-09-24
  • Int'l Joint Research
• [Presentation] Ln(O,F)BiS2におけるフェルミ面形状と化学圧力効果：角度分解光電子分光 (2015)
  • Author(s): 寺嶋健成, 脇田高徳, 砂川正典, 藤原弘和, 濱田貴裕, 長尾雅則, 綿打敏司, 田中功, 小野寛太, 組頭広志, 岡崎宏之, 高野義彦, 臼井秀知, 黒木和彦, 鈴木雄大, 村岡祐治, 横谷尚睦
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学千里山キャンパス（大阪）
  • Year and Date: 2015-09-16
• [Remarks] OKAYAMA UNIV. e-Bulletin
  • URL: http://www.okayama-u.ac.jp/user/kouhou/ebulletin/pdf/vol11.pdf