Novel quantum spin liquid states on honeycomb lattice iridium oxides

• Project/Area Number: 17H01140
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Takagi Hidenori 東京大学, 大学院理学系研究科(理学部), 教授 (40187935)
• Co-Investigator(Kenkyū-buntansha): 平岡 奈緒香 (太田奈緒香) 東京大学, 大学院理学系研究科(理学部), 助教 (40758827) ; 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): 2017-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥44,980,000 (Direct Cost: ¥34,600,000、Indirect Cost: ¥10,380,000); Fiscal Year 2019: ¥9,490,000 (Direct Cost: ¥7,300,000、Indirect Cost: ¥2,190,000); Fiscal Year 2018: ¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000); Fiscal Year 2017: ¥17,030,000 (Direct Cost: ¥13,100,000、Indirect Cost: ¥3,930,000)
• Keywords: 量子スピン液体 / Kitaev模型 / 量子磁性 / Ir酸化物 / 強相関電子系 / キタエフ模型 / ハニカム構造 / キタエフ系 / イリジウム酸化物 / エキシトニック磁性 / 中性子回折 / 核磁気共鳴

Outline of Final Research Achievements

Realization of quantum spin liquid is one of the grand challenges in condensed matter physics. A quantum spin liquid on honeycomb lattice theoretically discovered by Kitaev has been attracting considerable interests among the condensed matter scientists as it is obtained as the exact solution comprising of two kinds of Majorana fermions, itinerant and localized. In the honeycomb oxide H3LiIr2O6, we discovered that the interacting spin-orbital-entangled Jeff=1/2 moments do not show any signature of magnetic ordering, namely spontaneous symmetry breaking down to an extremely low temperature, which lead us to conclude the realization of a quantum spin liquid state.

Academic Significance and Societal Importance of the Research Achievements

Kitaevの理論模型に触発された量子スピン液体状態の実験的探索は世界的規模で研究が進んでいる。その舞台として当初提案された他のIr酸化物やRu塩化物では、いずれも量子スピン液体ではなく長距離磁気秩序の発現が観測されている。現実の物質での実現は不可能であるとも言われた。そのような状況の中でH3LiIr2O6に実験的に量子スピン液体の存在が確認されたことの意義は極めて大きい。さらに、この発見が液体状態発現の微視的起源、特にKitaev相互作用の役割や水素の役割など、新たな極めて挑戦的課題を投げかけていることも強調されるべきである。

Research Products

• [Int'l Joint Research] マックスプランク研究所/シュツットガルト大学(ドイツ)
• [Int'l Joint Research] マックスプランク研究所/シュトゥットガルト大学(ドイツ)
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• [Journal Article] Superconductivity at 4.8 K and Violation of Pauli Limit in La2IRu2 Comprising Ru Honeycomb Layer (2019)
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• [Journal Article] Contrasted Sn substitution effects on Dirac line node semimetals SrIrO3 and CaIrO3 (2019)
  • Author(s): M. Negishi, N. Hiraoka, D. Nishio-Hamane, H. Takagi
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  • Journal Title: APL Materials Volume: 7 Issue: 12
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• [Journal Article] Thermodynamic signatures of quantum criticality in cuprate superconductors (2019)
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• [Journal Article] Concept and realization of Kitaev quantum spin liquids (2019)
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  • Author(s): Jimenez-Segura Marco Polo、Takayama Tomohiro、Berardan David、Hoser Andreas、Reehuis Manfred、Takagi Hidenori、Dragoe Nita
  • Journal Title: Applied Physics Letters Volume: 114 Issue: 12 Pages: 122401-122401
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• [Journal Article] Spin waves and spin-state transitions in a ruthenate high-temperature antiferromagnet (2019)
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  • Journal Title: Nature Materials Volume: - Issue: 6 Pages: 563-567
  • DOI: 10.1038/s41563-019-0327-2
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• [Journal Article] Roles of Carrier Doping, Band Gap, and Electron Relaxation Time in the Boltzmann Transport Calculations of a Semiconductor’s Thermoelectric Properties (2018)
  • Author(s): Katsura Yukari、Takagi Hidenori、Kimura Kaoru
  • Journal Title: MATERIALS TRANSACTIONS Volume: 59 Issue: 7 Pages: 1013-1021
  • DOI: 10.2320/matertrans.E-M2018813
  • NAID: 130007410481
  • ISSN: 1345-9678, 1347-5320
  • Year and Date: 2018-07-01
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• [Journal Article] Neutron scattering length determination by means of total scattering (2018)
  • Author(s): Hannon Alex C.、Gibbs Alexandra S.、Takagi Hidenori
  • Journal Title: Journal of Applied Crystallography Volume: 51 Issue: 3 Pages: 854-866
  • DOI: 10.1107/s1600576718006064
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• [Journal Article] Probing the Jeff=0 ground state and the Van Vleck paramagnetism of the Ir5+ ions in layered Sr2Co0.5Ir0.5O4 (2018)
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• [Journal Article] Photo-excited dynamics in the excitonic insulator Ta2NiSe5 (2018)
  • Author(s): Werdehausen Daniel、Takayama Tomohiro、Albrecht Gelon、Lu Yangfan、Takagi Hidenori、Kaiser Stefan
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  • DOI: 10.1088/1361-648x/aacd76
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• [Journal Article] Infrared phonon spectra of quasi-one-dimensional Ta2NiSe5 and Ta2NiS5 (2018)
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• [Journal Article] Nature of the charge carriers in LaAlO3-SrTiO3 oxide heterostructures probed using hard X-ray photoelectron spectroscopy (2018)
  • Author(s): Mukherjee Sumanta、Pal Banabir、Sarkar Indranil、van Roekeghem Ambroise、Drube Wolfgang、Takagi H.、Matsuno Jobu、Biermann Silke、Sarma D. D.
  • Journal Title: EPL (Europhysics Letters) Volume: 123 Issue: 4 Pages: 47003-47003
  • DOI: 10.1209/0295-5075/123/47003
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• [Journal Article] Magnetotransport in Sr3PbO antiperovskite (2018)
  • Author(s): Suetsugu S., Hayama K., Rost A. W., Nuss J.、Muhle C., Kim J., Kitagawa K., Takagi H.
  • Journal Title: Physical Review B Volume: 98 Issue: 11 Pages: 115203-115203
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• [Journal Article] Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates (2018)
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  • Journal Title: Physical Review Letters Volume: 121 Issue: 7 Pages: 077004-077004
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• [Journal Article] Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6 (2018)
  • Author(s): Macdougal David、Gibbs Alexandra S.、Ying Tao、Wessel Stefan、Walker Helen C.、Voneshen David、Mila Frederic、Takagi Hidenori、Coldea Radu
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  • Author(s): Kitagawa K.、Takayama T.、Matsumoto Y.、Kato A.、Takano R.、Kishimoto Y.、Bette S.、Dinnebier R.、Jackeli G.、Takagi H.
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  • Author(s): S. Li, Y. Kobayashi, M. Itoh, D. Hirai, and H. Takagi
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  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Long-range interactions in the effective low-energy Hamiltonian of Sr2IrO4: A core-to-core resonant inelastic x-ray scattering study (2017)
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• [Journal Article] Ultrafast Electronic Band Gap Control in an Excitonic Insulator (2017)
  • Author(s): S. Mor, M. Herzog, D. Golez, P. Werner, M. Eckstein, N. Katayama, M. Nohara, H. Takagi, T. Mizokawa, C. Monney, J. Staehler
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• [Journal Article] Pressure tuning of bond-directional exchange interactions and magnetic frustration in the hyperhoneycomb iridate β-Li2IrO3 (2017)
  • Author(s): L. S. I. Veiga, M. Etter, K. Glazyrin, F. Sun, C. A. Escanhoela, G. Fabbris, J. R. L. Mardegan, P. S. Malavi, Y. Deng, P. P. Stavropoulos, H.-Y. Kee, W. G. Yang, M. van Veenendaal, J. S. Schilling, T. Takayama, H. Takagi, D. Haskel
  • Journal Title: Phys. Rev. B Volume: 96 Issue: 14
  • DOI: 10.1103/physrevb.96.140402
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Solution of the heavily stacking faulted crystal structure of the honeycomb iridate H3LiIr2O6 (2017)
  • Author(s): S. Bette, T. Takayama, K. Kitagawa, R. Takano, H. Takagi, R. E. Dinnebier
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• [Journal Article] Pressure studies on the antiferromagnetic Kondo semiconductor Ce(Ru1－xRhx)2Al10 (x = 0,0.1) (2017)
  • Author(s): H. Tanida, K. Kitagawa, N. Tateiwa, M. Sera, and T. Nishioka
  • Journal Title: Physical Review B Volume: 96 Issue: 23
  • DOI: 10.1103/physrevb.96.235131
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• [Journal Article] Pseudogap phase of cuprate superconductors confined by Fermi surface topology (2017)
  • Author(s): N. Doiron-Leyraud, O. Cyr-Choiniere, S. Badoux, A. Ataei, C. Collignon, A. Gourgout, S. Dufour-Beausejour, F. F. Tafti, F. Laliberte, M.-E. Boulanger, M. Matusiak, D. Graf, M. Kim, J.-S. Zhou, N. Momono, T. Kurosawa, H. Takagi, L. Taillefer
  • Journal Title: Nat. Commun. Volume: 8 Issue: 1
  • DOI: 10.1038/s41467-017-02122-x
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Giant orbital diamagnetism of three-dimensional Dirac electrons in Sr3PbO an- tiperovskite (2020)
  • Author(s): H. Takagi
  • Organizer: KTJ 2020
  • Int'l Joint Research / Invited
• [Presentation] Spins, charges and orbitals on frus- trated lattices in complex vanadates (2020)
  • Author(s): H. Takagi
  • Organizer: Workshop on Strongly correlated materials -perspectives, challenges and dreams
  • Int'l Joint Research / Invited
• [Presentation] Giant orbital diamagnetism of three-dimensional Dirac electrons in antiperovskite Sr3PbO (2019)
  • Author(s): S. Suetsugu, K. Kitagawa, T. Kariyado, K. Hayama, A. W. Rost, J. Nuss, C. Muhle, M. Ogata, H. Takagi
  • Organizer: CIFAR Quantum Materials Program Meeting
  • Int'l Joint Research
• [Presentation] Exotic spin-orbital entangled phases on honeycomb lattice (2019)
  • Author(s): H. Takagi
  • Organizer: PCTS conference Strongly Correlated Systems & Interactions in Quantum Matter
  • Int'l Joint Research / Invited
• [Presentation] Exotic spin-orbital entangled phases in 4d and 5d transition metal oxides (2019)
  • Author(s): H. Takagi
  • Organizer: Conference on Strongly Correlated Quantum Materials
  • Int'l Joint Research / Invited
• [Presentation] Exotic spin-orbital entangled phases in 4d and 5d transition metal oxides (2019)
  • Author(s): H. Takagi
  • Organizer: Workshop Low-dimensional emergent phenomena in correlated systems and topological quantum matter
  • Int'l Joint Research / Invited
• [Presentation] Exotic spin-orbital entangled phases in 4d and 5d transition metal oxides (2019)
  • Author(s): H. Takagi
  • Organizer: MPI-PKS Workshop ”Quantum Criticality and Topology in Correlated Electron Systems”
  • Int'l Joint Research / Invited
• [Presentation] f電子系ハニカム量子磁石YbCl3におけるKitaev量子スピン液体の探索 (2019)
  • Author(s): 安藤翔, 北川健太郎, 松本洋介, 高木英典
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] ランタノイド擬スピン1/2磁性とキタエフ量子スピン液体の探索 (2019)
  • Author(s): 北川健太郎, 松本洋介, 三宅厚志, 徳永将史, 露木裕太, 安藤翔, 高木英典
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] アンチペロブスカイトSr3PbOにおける3次元ディラック電子の磁気輸送測定 (2019)
  • Author(s): 末次祥大, 葉山慶平, 北川健太郎, R. A. W., N. J., M. C., 高木英典
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] キタエフ系ハニカム化合物の超高圧磁化測定 (2019)
  • Author(s): 露木裕太, 北川健太郎, K. Whiteaker, M. Blankenhorn, 高木英典
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 周波数領域角度分解光電子分光法によるTa2NiSe5における光誘起絶縁体金属転移の研究(理論) (2019)
  • Author(s): 篠原康, 鈴木剛, 魯楊帆, 渡邉真莉, 徐佳笛, 高木英典, 野原実, 片山尚幸, 澤博, 藤澤正美, 金井輝人, 石井順久, 板谷治郎, 溝川貴司, 岡﨑浩三, 辛埴, 石川顕一
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] CeCu2Si2の高圧下NQR/NMR (2019)
  • Author(s): 田中志和, 藤原賢二, 本山岳, 北川健太郎, 小林達生, 平田倫啓, 佐々木孝彦, S. Seiro, C. Geibel, F. Steglich
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 周波数領域角度分解光電子分光法によるTa2NiSe5における光誘起絶縁体金属転移の研究(実験) (2019)
  • Author(s): 鈴木剛, 篠原康, 魯楊帆, 渡邉真莉, 徐佳笛, 高木英典, 野原実, 片山尚幸, 澤博, 藤澤正美, 金井輝人, 石井順久, 板谷治郎, 溝川貴司, 石川顕一, 岡﨑浩三, 辛埴
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 高圧下33S-NMR測定によるSmSの圧力誘起非磁性?磁性転移研究 (2019)
  • Author(s): 吉田章吾, 山田陽彦, 小山岳秀, 中井祐介, 上田光一, 水戸毅, 北川健太郎, 芳賀芳範
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 5d1タンタル塩化物の電子状態と多極子秩序 (2019)
  • Author(s): 石川孟, 高山知弘, K. Reinhard, N. Jurgen, D. Robert, 北川健太郎, 石井賢司, 高木英典
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] 励起子絶縁体Ta2Ni1-xCoxSe5の時間分解光電子分光 (2019)
  • Author(s): 密岡拓心, 鈴木剛, 渡邉真莉, 藤澤正美, 金井輝人, 石井順久, 板谷治郎, 岡崎浩三, 辛埴, 野原実, 片山尚幸, 澤博, 魯楊帆, 高木英典, 溝川貴司
  • Organizer: 日本物理学会2019年秋季大会
• [Presentation] Exotic spin-orbital entangled phases in 5d and 4d transition metal oxides (2019)
  • Author(s): H. Takagi
  • Organizer: 26th Int. Workshop on Oxide Electronics (iWOE 26)
  • Invited
• [Presentation] Giant orbital diamagnetism of three-dimensional Dirac electrons in Sr3PbO an- tiperovskite (2019)
  • Author(s): H. Takagi
  • Organizer: ICTP workshop
  • Int'l Joint Research / Invited
• [Presentation] Contrasting effects of Sn doping in correlated Dirac node semimetals SrIrO3 and CaIrO3 (2019)
  • Author(s): M. Negishi, N. Hiraoka, D. Nishio-Hamane, H. Ohsumi, H. Takagi
  • Organizer: 第 13 回 物性科学領域横断研究会（領域合同研究会）
• [Presentation] Giant isotope effect observed in the honeycomb iridate H3LiIr2O6 (2019)
  • Author(s): H. Takagi
  • Organizer: 3rd Asia-Pacific Workshop on Quantum Magnetism
  • Int'l Joint Research / Invited
• [Presentation] ハニカム格子希土類酸化物の磁性 (2019)
  • Author(s): 露木裕太, 北川健太郎, K. Whiteaker, M. Blankenhorn, 高木英典
  • Organizer: 第 13 回 物性科学領域横断研究会（領域合同研究会）
• [Presentation] Contrasting effects of Sn doping in correlated Dirac node semimetals SrIrO3 and CaIrO3 (2019)
  • Author(s): M. Negishi, N. Hiraoka, D. Nishio-Hamane, H. Ohsumi, H. Takagi
  • Organizer: Max Planck- UBC-UTokyo Centre for Quantum Materials 2019 Workshop
  • Int'l Joint Research
• [Presentation] LS/jj coupling scheme study on cubic K2TMCl6 (TM = Ru, Os) as seen by NQR (2019)
  • Author(s): R. Oka, K. Kitagawa, H. Takagi
  • Organizer: Max Planck- UBC-UTokyo Centre for Quantum Materials 2019 Workshop
  • Int'l Joint Research
• [Presentation] Pseudospin-1/2 Magnetism and Phase Diagram in quest for Kitaev Spin Liquid (2019)
  • Author(s): K. Kitagawa
  • Organizer: International Conference on Topological Materi- als Science 2019 (TopoMat2019)
  • Int'l Joint Research / Invited
• [Presentation] Pseudospin magnetism and phase di- agram in quest of Kitaev spin liquid (2019)
  • Author(s): K. Kitagawa
  • Organizer: Max Planck- UBC-UTokyo Centre for Quantum Materials 2019 Workshop
  • Int'l Joint Research / Invited
• [Presentation] Quantum Spin Liquid in 5d Electron Honeycomb Compound H3LiIr2O6, (2019)
  • Author(s): K. Kitagawa
  • Organizer: 2019 Joint MMM-Intermag Conference
  • Int'l Joint Research / Invited
• [Presentation] Excitonic Transition in the layered chalcogenide Ta2NiSe5 (2019)
  • Author(s): H. Takagi
  • Organizer: JKT 2019
  • Int'l Joint Research / Invited
• [Presentation] A spin orbital-entangled quantum liquid on a honeycomb lattice (2019)
  • Author(s): H. Takagi
  • Organizer: APS March Meeting 2019
  • Int'l Joint Research / Invited
• [Presentation] キタエフ系ハニカム化合物の超高圧磁化測定 (2019)
  • Author(s): 露木裕太, 北川健太郎, Kelton Whiteaker, Marian Blankenhorn, 高木英典
  • Organizer: 日本物理学会第74回年次大会(2019年)
• [Presentation] 層状ハニカム型イリジウム酸化物のエピタキシャル薄膜合成 (2019)
  • Author(s): 根岸真通, 北川健太郎, 高木英典
  • Organizer: 日本物理学会第74回年次大会(2019年)
• [Presentation] アンチペロブスカイトSr$_3$PbOにおける3次元ディラック電子の巨大軌道反磁性 (2019)
  • Author(s): 末次祥大, 北川健太郎, 苅宿俊風, 葉山慶平, A. W. Rost, J. Nuss, C. Muhle, 小形正男, 高木英典
  • Organizer: 日本物理学会第74回年次大会(2019年)
• [Presentation] Interplay of spin-orbit coupling and electron correlations in 4d and 5d transition metal oxides (2018)
  • Author(s): H. Takagi
  • Organizer: 5th International Workshop on Complex Oxides
  • Int'l Joint Research / Invited
• [Presentation] Spin-orbital entangled quantum liquid in H3LiIr2O6 (2018)
  • Author(s): H. Takagi
  • Organizer: Trends in Quantum Magnetism, WE Heraeus Seminar
  • Int'l Joint Research / Invited
• [Presentation] When spins and charges feel frustrated... (2018)
  • Author(s): H. Takagi
  • Organizer: Symposium "Innovation and Creativity in Science"
  • Int'l Joint Research / Invited
• [Presentation] Liquid and solid states of spin orbital entangled matter in 4d and 5d transition metal oxides (2018)
  • Author(s): H. Takagi
  • Organizer: Telluride workshop on Enhanced Functionalities in 4 and 5d Containing Material from Large Spin-Orbit Coupling
  • Int'l Joint Research / Invited
• [Presentation] Spin-orbital quantum liquid on honeycomb lattice (2018)
  • Author(s): H. Takagi
  • Organizer: TEMM2018
  • Int'l Joint Research / Invited
• [Presentation] Qunatum Spin Liquid (2018)
  • Author(s): H. Takagi
  • Organizer: Advanced School and Workshop on Correlations in Electron Systems: from Quantum Criticality to Topology
  • Int'l Joint Research / Invited
• [Presentation] ハニカム格子系Li2RuO3薄膜の成長条件と輸送特性 (2018)
  • Author(s): 山村凌平, 平岡奈緒香, 北川健太郎, 高木英典
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] アンチペロブスカイトSr3PbOにおける3次元ディラック電子の巨大軌道反磁性, (2018)
  • Author(s): 末次祥大, 北川健太郎, 苅宿俊風, 葉山慶平, A. W. Rost, J. Nuss, C. Muhle, 小形正男, 高木英典
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] ステップ基板を用いたペロブスカイト型Sr(Ir1-x,SnxO3薄膜の配向制御と電気輸送特性, (2018)
  • Author(s): 根岸真通, 平岡奈緒香, 高木英典
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] Excitonic transition (and q=0 CDW) in Ta2NiSe5 (2018)
  • Author(s): H. Takagi
  • Organizer: E-MRS meeting
  • Int'l Joint Research / Invited
• [Presentation] Exploring novel quantum phases in 5d transition metal oxides (2018)
  • Author(s): H. Takagi
  • Organizer: CIFAR meeting on quantum materials
  • Int'l Joint Research / Invited
• [Presentation] Exotic Phase of spin-orbital entangled matter (2018)
  • Author(s): H. Takagi
  • Organizer: MPI-UBC-UTokyo workshop
  • Int'l Joint Research / Invited
• [Presentation] Quantum Liquid and Phase Diagram of Honeycomb and Hyperhoneycomb Iridates (2018)
  • Author(s): K. Kitagawa
  • Organizer: TMS-EPiQS 2nd Alliance Workshop: Topological magnets and topological superconductors
  • Int'l Joint Research / Invited
• [Presentation] Spin-orbital entangled quantum liquid on honeycomb lattice (2018)
  • Author(s): H. Takagi
  • Organizer: High Temperature Superconductivity - Unifying Themes in Diverse Materials, Aspen Winter Conference
  • Int'l Joint Research / Invited
• [Presentation] Exotic spin-orbital entangled state in 4d and 5d transition metal oxides - beyond Jeff=1/2 physics (2018)
  • Author(s): H. Takagi
  • Organizer: The 18th Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems (TJK18)
  • Int'l Joint Research / Invited
• [Presentation] Excitonic insulator transition and Superconductivity in Ta2NiSe5 (2018)
  • Author(s): H. Takagi
  • Organizer: Colloquium
  • Int'l Joint Research / Invited
• [Presentation] High-pressure phase diagram by NMR study on hyperhoneycomb β-Li2IrO3 (2018)
  • Author(s): Y. Hayashi, K. Kitagawa, S. Sasaki, T. Takayama, H. Takagi
  • Organizer: Max Plank-UBC-UTokyo School - Elementary Excitations in Quantum Materials -
  • Int'l Joint Research
• [Presentation] Phase control of Dirac node electrons in perovskite-type (Sr,Ca)IrO3 thin films (2018)
  • Author(s): M. Negishi, N. Hiraoka, D. Nishio-Hamane, H. Ohsumi, H. Takagi
  • Organizer: Max Plank-UBC-UTokyo School - Elementary Excitations in Quantum Materials -
  • Int'l Joint Research
• [Presentation] Three-dimensional massive Dirac electrons in Sr3PbO antiperovskite (2018)
  • Author(s): S. Suetsugu, K. Kitagawa, K. Hayama, A. W. Rost, C. Muehle, J. Nuss, H. Takagi
  • Organizer: Max Plank-UBC-UTokyo School - Elementary Excitations in Quantum Materials -
  • Int'l Joint Research
• [Presentation] High-pressure phase diagram by NMR study on hyperhoneycomb β-Li2IrO3 (2018)
  • Author(s): Y. Hayashi, K. Kitagawa, S. Sasaki, T. Takayama, H. Takagi
  • Organizer: The 18th Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems (TJK18)
  • Int'l Joint Research
• [Presentation] Quantum Liquid of Honeycomb Iridate (2018)
  • Author(s): K. Kitagawa, T. Takayama, Y. Matsumoto, Y. Kishimoto, R. Takano, H. Takagi
  • Organizer: The 18th Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems (TJK18)
  • Int'l Joint Research
• [Presentation] Phase control of Dirac node electrons in perovskite-type (Sr,Ca)IrO3 thin films (2018)
  • Author(s): M. Negishi, N. Hiraoka, D. Nishio-Hamane, H. Ohsumi, H. Takagi
  • Organizer: The 18th Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems (TJK18)
  • Int'l Joint Research
• [Presentation] Three-dimensional massive Dirac electrons in Sr3PbO antiperovskite (2018)
  • Author(s): S. Suetsugu, K. Kitagawa, K. Hayama, A. W. Rost, C. Muehle, J. Nuss, H. Takagi
  • Organizer: The 18th Taiwan-Japan-Korea Symposium on Strongly Correlated Electron Systems (TJK18)
  • Int'l Joint Research
• [Presentation] ハニカム格子上のスピン軌道量子液体 (2018)
  • Author(s): 高木英典
  • Organizer: 日本物理学会第73回年次大会
  • Invited
• [Presentation] ハイパーハニカムβ-Li2IrO3 のNMR・磁化測定による高圧相図 (2018)
  • Author(s): 林義之, 北川健太郎, 佐々木秀, 高山知弘, 高木英典
  • Organizer: 第9回低温センター研究交流会
• [Presentation] ペロブスカイト型SrIr1-xSnxO3薄膜の電子状態と弱強磁性 (2018)
  • Author(s): 根岸真通, 平岡奈緒香, 高木英典
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] ダブルペロブスカイト型La2MgRuO6 薄膜の成長条件と輸送特性 (2018)
  • Author(s): 山村凌平, 平岡奈緒香, 高木英典, 浜根大輔
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] ハイパーハニカムβ-Li2IrO3のNMR・磁化測定による高圧相図 (2018)
  • Author(s): 林義之, 北川健太郎, 佐々木秀, 岸本恭来, 高山知弘, 高木英典
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] 3次元ディラック電子系アンチペロブスカイトSr3PbOにおける巨大反磁性 (2018)
  • Author(s): 末次祥大, 北川健太郎, 葉山慶平, A. W. Rost, J. Nuss, C. Muhle, 高木英典
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Correlated Topological Phases in Complex Ir Oxides (2017)
  • Author(s): H. Takagi
  • Organizer: International Conference on Topological Materials Science 2017 (TopoMat2017)
  • Int'l Joint Research / Invited
• [Presentation] Quantum Liquid state of Jeff=1/2 isospins in complex Ir oxides (2017)
  • Author(s): H. Takagi
  • Organizer: SPICE Workshop on Spin Dyamics in the Dirac Systems
  • Int'l Joint Research / Invited
• [Presentation] Correlated Topological Phases in Complex Ir Oxides (2017)
  • Author(s): H. Takagi
  • Organizer: Gordon Research Conference on “Topological & Correlated Matter: From Fundamentals to New Discoveries”
  • Int'l Joint Research / Invited
• [Presentation] Topological quantum spin liquid - “Zen” world (2017)
  • Author(s): H. Takagi
  • Organizer: Competing Interactions and Colossal Responses in Transition Metal Compounds
  • Int'l Joint Research / Invited
• [Presentation] Quantum liquid state of Jeff=1/2 isospins in complex Ir oxides (2017)
  • Author(s): H. Takagi
  • Organizer: Beyond! Topology and Materials
  • Int'l Joint Research / Invited
• [Presentation] Spin-orbital entangled quantum spin liquid on honeycomb lattice (2017)
  • Author(s): H. Takagi
  • Organizer: KITP conference on “Order, Fluctuations, and Strong Correlations: New Platforms and Developments”
  • Int'l Joint Research / Invited
• [Presentation] Quantum Liquid state of Jeff=1/2 isospins in complex Ir oxides (Half-Plenary) (2017)
  • Author(s): H. Takagi
  • Organizer: 28th International Conference on Low Temperature Physics
  • Int'l Joint Research / Invited
• [Presentation] New Jeff=1/2 Quantum Liquid on Honeycomb Lattice (2017)
  • Author(s): K. Kitagawa
  • Organizer: 1st Asia Pacific Workshop on Quantum Magnetism (APWQM 2017)
  • Int'l Joint Research / Invited
• [Presentation] Zero-gap semiconductor to excitonic insulator transition in Ta2NiSe5 (2017)
  • Author(s): H. Takagi
  • Organizer: 2018 European Materials Research Society (E-MRS) Fall Meeting
  • Int'l Joint Research / Invited
• [Presentation] Quantum Liquid state of Jeff=1/2 isospins in complex Ir oxides (2017)
  • Author(s): H. Takagi
  • Organizer: Junjiro Kanamori Memorial International Symposium - New Horizon of Magnetism
  • Int'l Joint Research / Invited
• [Presentation] Electronic phase control of perovskite SrIrO3 with Dirac line nodes (2017)
  • Author(s): N. Hiraoka
  • Organizer: Gordon Godfrey Workshop 2017 on Spins and Strong Electron Correlations
  • Int'l Joint Research / Invited
• [Presentation] Spin-orbit coupling meets with electron correlations - A guided tour to complex iridium oxides - (2017)
  • Author(s): H. Takagi
  • Organizer: Solid State Chemistry Meeting
  • Int'l Joint Research / Invited
• [Presentation] Quantum Spin Liquid Phenomena in Honeycomb and Hyperhoneycomb Iridates (2017)
  • Author(s): K. Kitagawa
  • Organizer: International Workshop on Frontiers of Research in Quantum Materials
  • Int'l Joint Research / Invited
• [Presentation] Electronic phase control of SrIrO3 with Dirac line nodes (2017)
  • Author(s): N. Hiraoka
  • Organizer: JSPS Core-to-Core Workshop on Novel Quantum and Functional Materials -Design and Sysnthesis-
  • Int'l Joint Research
• [Presentation] Dirac Semimetal-Magnetic Insulator Transition in Perovskite AIr1-xSnxO3 Thin Films (A = Ca, Sr) (2017)
  • Author(s): M. Negishi, N. Hiraoka, D. Nishio-Hamane, H. Ohsumi, H. Takagi
  • Organizer: Yamada Science Foundation Junjiro Kanamori Memorial International Symposium - New Horizon of Magnetism -
  • Int'l Joint Research
• [Presentation] ハニカム・ハイパーハニカムIr 酸化物のスピン液体物性 (2017)
  • Author(s): 北川健太郎
  • Organizer: 科学研究費補助金 基盤研究(A)研究会「第二回 量子スピン液体研究の新展開」
  • Invited
• [Presentation] 高圧下量子スピン液体β-Li2IrO3単結晶のNMR (2017)
  • Author(s): 林義之, 北川健太郎, 岸本恭来, 高山知弘, 高木英典
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] ペロブスカイト型AIr1-xSnxO3薄膜(A = Ca, Sr)の半金属‐磁性絶縁体転移 (2017)
  • Author(s): 根岸真通, 平岡奈緒香, 大隅寛幸, 高木英典
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] アンチペロブスカイトSr3PbOにおける3次元ディラック電子と巨大反磁性 (2017)
  • Author(s): 末次祥大, 北川健太郎, 葉山慶平, A. W. Rost, J. Nuss, C. Muhle, 高木英典
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Ultrahigh-pressure NMR and magnetization study on hyperhoneycomb beta-Li2IrO3 (2017)
  • Author(s): 林義之, 北川健太郎, 佐々木秀, 岸本恭来, 高山知弘, 高木英典
  • Organizer: 第11回物性科学領域横断研究会
• [Remarks] 高木・北川研究室ホームページ
  • URL: http://park.itc.u-tokyo.ac.jp/takagi_lab/