High-pressure study of exciton condensation and superconductivity

• Project/Area Number: 18H01172
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: The University of Electro-Communications
• Principal Investigator: Matsubayashi Kazuyuki 電気通信大学, 大学院情報理工学研究科, 准教授 (10451890)
• Co-Investigator(Kenkyū-buntansha): 片山 尚幸 名古屋大学, 工学研究科, 准教授 (50623758) ; 北川 健太郎 東京大学, 大学院理学系研究科(理学部), 講師 (90567661)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000); Fiscal Year 2020: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000); Fiscal Year 2019: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000); Fiscal Year 2018: ¥10,660,000 (Direct Cost: ¥8,200,000、Indirect Cost: ¥2,460,000)
• Keywords: 励起子 / 圧力誘起超伝導 / 半導体-半金属転移 / 超伝導 / 圧力効果 / 電子-格子相互作用 / 半導体-金属転移 / 量子臨界現象

Outline of Final Research Achievements

We have constructed a comprehensive pressure-temperature phase diagram of the excitonic insulator Ta2NiSe5. In particular, a partial gap involving electron-lattice interaction appears in the high-pressure semimetallic phase, and superconductivity emerges around a critical pressure where the collapse of the gap is observed. We have also discovered pressure-induced superconductivity in BiS2-based layered compounds located near the semiconductor-semimetal transition and observed the similar phase diagram for Ta2NiSe5.

Academic Significance and Societal Importance of the Research Achievements

本研究では、電子と正孔の対形成による励起子と電子同士が対形成した超伝導クーパー対の量子凝縮相を同一物質中で圧力のみを制御することで観測することに初めて実験的に成功した。本研究の成果は半導体と半金属の境界領域で発現する多彩な量子相の形成に、クーロン引力と電子-格子相互作用が重要な役割を果たしていることを示唆しており、今後の物質開発に対して新たな指針を提供すると期待される。

Research Products

• [Int'l Joint Research] マックス・プランク固体物理学研究所(ドイツ)
• [Int'l Joint Research] Chinese Academy of Sciences(中国)
• [Journal Article] Magnetic Measurements of Narrow-Gap Semiconductor FeSb₂ under High Pressure (2020)
  • Author(s): Deguchi Takuya、Matsubayashi Kazuyuki、Uwatoko Yoshiya、Koyama Takehide、Kohara Takao、Nakamura Hiroyuki、Mitsui Yoshifuru、Koyama Keiichi
  • Journal Title: MATERIALS TRANSACTIONS Volume: 61 Issue: 8 Pages: 1476-1479
  • DOI: 10.2320/matertrans.MT-MN2019015
  • NAID: 130007879849
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2020-07-01
  • Peer Reviewed / Open Access
• [Journal Article] Resistive anisotropy of candidate excitonic insulator Ta2NiSe5 under pressure (2020)
  • Author(s): H. Arima, Y. Naito, K. Kudo, N. Katayama, H. Sawa, M. Nohara, Y. F. Lu, K. Kitagawa, H. Takagi, Y. Uwatoko and K. Matsubayashi
  • Journal Title: J. Phys Volume: 1609 Issue: 1 Pages: 012001-012001
  • DOI: 10.1088/1742-6596/1609/1/012001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High-Pressure Hall Effect Measurement on Ta2NiSe5 as a Candidate for Excitonic Insulator (2020)
  • Author(s): Arima Hiroto、Naito Yasushi、Kudo Kazuki、Katayama Naoyuki、Sawa Hiroshi、Nohara Minoru、Lu Yangfan、Kitagawa Kentaro、Takagi Hidenori、Uwatoko Yoshiya、Matsubayashi Kazuyuki
  • Journal Title: JPS Conference Proceedings Volume: 30 Pages: 011031-011031
  • DOI: 10.7566/jpscp.30.011031
  • Peer Reviewed / Open Access
• [Journal Article] Superconducting-Gap Anisotropy of Iron Pnictides Investigated via Combinatorial Microwave Measurements (2020)
  • Author(s): Tatsunori Okada, Yoshinori Imai, Kentaro Kitagawa, Kazuyuki Matsubayashi, Masamichi Nakajima, Akira Iyo, Yoshiya Uwatoko, Hiroshi Eisaki, and Atsutaka Maeda
  • Journal Title: Scientific Reports Volume: 10 Issue: 1 Pages: 7064-7064
  • DOI: 10.1038/s41598-020-63304-0
  • Peer Reviewed / Open Access
• [Journal Article] Robust two-gap strong coupling superconductivity associated with low-lying phonon modes in pressurized Nb5Ir3O superconductors (2019)
  • Author(s): Wang Bosen、Zhang Yaoqing、Xu Shuxiang、Ishigaki Kento、Matsubayashi Kazuyuki、Cheng Jin-Guang、Hosono Hideo、Uwatoko Yoshiya
  • Journal Title: Chinese Physics B Volume: 28 Issue: 10 Pages: 107401-107401
  • DOI: 10.1088/1674-1056/ab4047
  • Peer Reviewed
• [Journal Article] Pressure-induced enhancement of superconductivity and quantum criticality in the 12442-type hybrid-structure superconductor KCa2Fe4As4F2 (2019)
  • Author(s): Wang Bosen、Wang Zhi-Cheng、Ishigaki Kento、Matsubayashi Kazuyuki、Eto Tetsujiro、Sun Jianping、Cheng Jin-Guang、Cao Guang-Han、Uwatoko Yoshiya
  • Journal Title: Physical Review B Volume: 99 Issue: 1 Pages: 014501-014501
  • DOI: 10.1103/physrevb.99.014501
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Effect of Cu intercalation and pressure on excitonic interaction in 1T-TiSe2 (2019)
  • Author(s): Kitou S.、Nakano A.、Kobayashi S.、Sugawara K.、Katayama N.、Maejima N.、Machida A.、Watanuki T.、Ichimura K.、Tanda S.、Nakamura T.、Sawa H.
  • Journal Title: Physical Review B Volume: 99 Issue: 10 Pages: 104109-104109
  • DOI: 10.1103/physrevb.99.104109
  • Peer Reviewed
• [Journal Article] Honeycomb lattice type charge density wave associated with interlayer Cu ions ordering in 1T-CuxTiSe2 (2019)
  • Author(s): Kitou Shunsuke、Kobayashi Shintaro、Kaneko Tatsuya、Katayama Naoyuki、Yunoki Seiji、Nakamura Toshikazu、Sawa Hiroshi
  • Journal Title: Physical Review B Volume: 99 Issue: 8 Pages: 081111-081111
  • DOI: 10.1103/physrevb.99.081111
  • NAID: 120006643273
  • Peer Reviewed
• [Journal Article] Pressure-Induced Novel Quantum Phase Transition in 4<i>f</i>-Electron Systems (2018)
  • Author(s): 松林 和幸、上床 美也
  • Journal Title: Butsuri Volume: 73 Issue: 5 Pages: 292-296
  • DOI: 10.11316/butsuri.73.5_292
  • NAID: 130007590580
  • ISSN: 0029-0181, 2423-8872
  • Year and Date: 2018-05-05
  • Peer Reviewed
• [Journal Article] Two distinct superconducting phases and pressure-induced crossover from type-II to type-I superconductivity in the spin-orbit-coupled superconductors BaBi3 and SrBi3 (2018)
  • Author(s): Wang Bosen、Luo Xuan、Ishigaki Kento、Matsubayashi Kazuyuki、Cheng Jinguang、Sun Yuping、Uwatoko Yoshiya
  • Journal Title: Physical Review B Volume: 98 Issue: 22 Pages: 220506-220506
  • DOI: 10.1103/physrevb.98.220506
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Universal phase diagram of superconductivity and charge density wave versus high hydrostatic pressure in pure and Se-doped 1T-TaS2 (2018)
  • Author(s): Wang Bosen、Liu Yu、Luo Xuan、Ishigaki Kento、Matsubayashi Kazuyuki、Lu Wenjian、Sun Yuping、Cheng Jinguang、Uwatoko Yoshiya
  • Journal Title: Physical Review B Volume: 97 Issue: 22 Pages: 220504-220504
  • DOI: 10.1103/physrevb.97.220504
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Antiferroelectric distortion with anomalous phonon softening in the excitonic insulator Ta2NiSe5 (2018)
  • Author(s): Nakano Akitoshi、Hasegawa Takumi、Tamura Shinya、Katayama Naoyuki、Tsutsui Satoshi、Sawa Hiroshi
  • Journal Title: Physical Review B Volume: 98 Issue: 4 Pages: 045139-045139
  • DOI: 10.1103/physrevb.98.045139
  • Peer Reviewed / Open Access
• [Journal Article] A spin?orbital-entangled quantum liquid on a honeycomb lattice (2018)
  • Author(s): Kitagawa K.、Takayama T.、Matsumoto Y.、Kato A.、Takano R.、Kishimoto Y.、Bette S.、Dinnebier R.、Jackeli G.、Takagi H.
  • Journal Title: Nature Volume: 554 Issue: 7692 Pages: 341-345
  • DOI: 10.1038/nature25482
  • Peer Reviewed / Int'l Joint Research
• [Presentation] BiS2系層状化合物の単結晶試料における高圧力下電気伝導測定 (2021)
  • Author(s): 有馬寛人, Y. Yuan, 成田傑, 工藤一輝, 矢藤優佑, Rajveer Jha, 後藤陽介, 水口佳一, 東中隆二, 松田達麿, 青木勇二, 松林和幸
  • Organizer: 日本物理学会 第76回年次大会
• [Presentation] PrTi2Al20の強四極子秩序が消失した高圧域での非フェルミ液体的挙動 (2021)
  • Author(s): 山本洸凪, 元山史都, 曾我部尚希, 磯前貴央, 酒井明人, 中辻知, 北川健太郎, 上床美也, 松林和幸
  • Organizer: 日本物理学会 第76回年次大会
• [Presentation] BiS2系類縁化合物における圧力誘起超伝導 (2020)
  • Author(s): 松林和幸, 有馬寛人, YAHUA Yuan, 内藤康氏, JHA Rajveer, 後藤陽介, 水口佳一, 松田達麿, 青木勇二
  • Organizer: 第61回高圧討論会
• [Presentation] BiS2系層状化合物における圧力誘起半導体-半金属転移と超伝導 (2020)
  • Author(s): 有馬寛人, Y. Yuan, 内藤康氏, 工藤一輝, 矢藤優佑, Rajveer Jha, 後藤陽介, 水口佳一, 東中隆二, 松田達麿, 青木勇二, 松林和幸
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高圧力下におけるPrTi2Al20の重い電子超伝導 (2020)
  • Author(s): 山本洸凪, 元山史都, 曾我部尚希, 磯前貴央, 酒井明人, 中辻知, 北川健太郎, 上床美也, 松林和幸
  • Organizer: 日本物理学会秋季大会
• [Presentation] Pr1-2-20 系の超伝導と重い電子状態、非フェルミ液体状態に対 する圧力効果 (2020)
  • Author(s): 松林 和幸
  • Organizer: J-Physics:多極子伝導系の物理 令和元年度領域全体会議
• [Presentation] 高圧力下・極低温・磁場中におけるYbCo2Zn20の熱電能 (2020)
  • Author(s): 工藤一輝, 内藤康氏, 有馬寛人, 上床美也, 松林和幸
  • Organizer: 日本物理学会 第75回年次大会
• [Presentation] PrRu2Sn2Zn18における四極子秩序の圧力効果 (2020)
  • Author(s): 山本洸凪, 駒形貴裕, 脇舎和平, 梅原出, 郷地順, 上床美也, 松林和幸
  • Organizer: 日本物理学会 第75回年次大会
• [Presentation] BiS2系層状化合物の温度-圧力相図 (2020)
  • Author(s): 有馬寛人, Y. Yuan, 内藤康氏, 工藤一輝, 矢藤優佑, Rajveer Jha, 後藤陽介, 水口佳一, 松田達麿, 青木勇二, 松林和幸
  • Organizer: 日本物理学会 第75回年次大会
• [Presentation] Pressure-induced heavy fermion superconductivity and non-Fermi liquid behavior in non-Kramers doublet system PrT2Al20 (T = Ti, V) (2019)
  • Author(s): Kazuyuki Matsubayashi
  • Organizer: International Conference on Strongly Correlated Electron Systems 2019 (SCES '19)
  • Int'l Joint Research / Invited
• [Presentation] Effect of pressure on heavy fermion superconductivity in the quadrupole system PrTi2Al20 (2019)
  • Author(s): Kazuyuki Matsubayashi
  • Organizer: International workshop on Spin-Orbit Interaction and G-factor (SOIG 2019)
  • Int'l Joint Research / Invited
• [Presentation] PrT2Al20 (T = Ti, V)における圧力誘起重い電子超伝導と非フェルミ液体的挙動 (2019)
  • Author(s): 松林 和幸
  • Organizer: J-Physics 地域研究会
• [Presentation] Effect of pressure on the quadrupolar and magnetic order in cubic double perovskite Ba2MgReO6 (2019)
  • Author(s): H. Arima, D. Hirai, Z. Hiroi, K. Matsubayashi
  • Organizer: J-Physics 2019 International Conference
  • Int'l Joint Research
• [Presentation] AC specific heat measurement of PrTi2Al20under pressure (2019)
  • Author(s): R. Hoshi, F. Motoyama, R. Kuwata, S. Kittaka, Y. Uwatoko, N. Sokabe, A. Sakai, S. Nakatsuji, K. Kitagawa, K. Matsubayashi
  • Organizer: J-Physics 2019 International Conference
  • Int'l Joint Research
• [Presentation] High-pressure Hall effect measurement on Ta2NiSe5 as a candidate for excitonic insulator (2019)
  • Author(s): H. Arima, Y. Naito, K. Kudo, N. Katayama, H. Sawa, M. Nohara, Y. Lu, K. Kitagawa, H. Takagi, Y. Uwatoko, K. Matsubayashi
  • Organizer: International Conference on Strongly Correlated Electron Systems 2019 (SCES '19)
  • Int'l Joint Research
• [Presentation] Resistive anisotropy of candidate excitonic insulator Ta2NiSe5 under pressure (2019)
  • Author(s): H. Arima, Y. Naito, K. Kudo, N. Katayama, H. Sawa, M. Nohara, Y. F. Lu, K. Kitagawa, H. Takagi, Y. Uwatoko, K. Matsubayashi
  • Organizer: The 27th AIRAPT International Conference on High Pressure Science and Technology (AIRAPT27)
  • Int'l Joint Research
• [Presentation] 立方晶PrRu2Sn2Zn18の多極子秩序 (2019)
  • Author(s): 脇舎和平, 駒形貴裕, 杉山雄紀, 上原政智, 郷地順, 松林和幸, 上床美也, 梅原出
  • Organizer: 日本物理学会秋季大会
• [Presentation] LaOBiPbS3およびLa2O2Bi3AgS6における圧力誘起超伝導と高圧下における電気輸送特性 (2019)
  • Author(s): 内藤康氏, 工藤一輝, 有馬寛人, 辺土正人, Rajveer Jha, 後藤陽介, 松田達磨, 青木勇二, 水口佳一, 松林和幸
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高圧下における熱電能測定法の開発とYbCo2Zn20への応用 (2019)
  • Author(s): 工藤一輝, 内藤康氏, 有馬寛人, 上床美也, 松林和幸
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高圧力を用いた新奇な量子相転移と超伝導の探索 (2018)
  • Author(s): 松林和幸
  • Organizer: 京都大学基礎物理学研究所研究会「電子相関が生み出す新規な秩序と超伝導現象:トポロジー、液晶状態、動的現象」
  • Invited
• [Presentation] Pressure-induced novel superconductivity and quantum critical phenomena in nonmagnetic systems (2018)
  • Author(s): K. Matsubayashi
  • Organizer: Joint Eighteenth International Conference on HIGH PRESSURE SEMICONDUCTOR PHYSICS & Second International Workshop on HIGH PRESSURE STUDY OF SUPERCONDUCTORS (HPSP18&WHS2)
  • Int'l Joint Research / Invited
• [Presentation] Ta2NiSe5の相図における静水圧と異方的圧力効果の比較 (2018)
  • Author(s): 有馬寛人, 片山尚幸, 野原実, 魯楊帆, 北川健太郎, 高木英典, 上床美也, 松林和幸
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高圧下におけるTa2NiSe5の輸送特性 (2018)
  • Author(s): 有馬寛人, 内藤康氏, 工藤一輝, 片山尚幸, 澤博, 野原実, 魯楊帆, 北川健太郎, 高木英典, 上床美也, 松林和幸
  • Organizer: 日本物理学会 第74回年次大会
• [Presentation] 高圧下における熱電能測定装置の開発 (2018)
  • Author(s): 内藤康氏, 工藤一輝, 有馬寛人, 辺土正人, 松林和幸
  • Organizer: 日本物理学会 第74回年次大会
• [Remarks] 研究室Webページ
  • URL: http://www.m-lab.es.uec.ac.jp/Matsubayashi_Group/Home.html