Novel quantum states induced by valence and orbital fluctuations

• Project/Area Number: 25707030
• Research Category: Grant-in-Aid for Young Scientists (A)
• Allocation Type: Partial Multi-year Fund
• Research Field: Condensed matter physics II
• Research Institution: The University of Tokyo
• Principal Investigator: Nakatsuji Satoru 東京大学, 物性研究所, 教授 (70362431)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Project Status: Completed (Fiscal Year 2015)
• Budget Amount: ¥26,260,000 (Direct Cost: ¥20,200,000、Indirect Cost: ¥6,060,000); Fiscal Year 2015: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2014: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000); Fiscal Year 2013: ¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
• Keywords: 価数揺らぎ / 軌道揺らぎ / 量子臨界現象 / スピン・軌道液体 / 重い電子超伝導 / 異常金属 / 価数揺動 / スピン液体 / 量子スピン軌道液体 / 重い電子系超伝導 / 多極子秩序 / 価数搖動 / 量子スピンアイス

Outline of Final Research Achievements

Our study revealed the following novel quantum states in correlated electron systems. (1) In the valence fluctuating system β-YbAlB4, we found that a quantum criticality is stable in the finite range of pressure and appears without magnetic criticality, suggesting a formation of a strange metal phase due to strong valence fluctuations. Secondly, our success in growing a high quality single crystal of the quadrupolar heavy fermion system PrV2Al20 lead us to discover that PrV2Al20 exhibits a heavy fermion superconductivity in the anti-quadrupolar ordered phase. Furthermore, our pressure measurements found that this superconductivity is most likely driven by the quantum critical quadrupolar fluctuations. (2) In our studies on Ba3CuSb2O9, we reported the first observation of striking absence of the static Jahn-Teller distortion down to the lowest temperature, and the first determination of dynamic Jahn-Teller frequencies, indicating the formation of a quantum spin-orbital liquid state.

Research Products

• [Journal Article] Pressure-Induced Local Structural Changes in Heavy Fermion b-YbAlB4 (2016)
  • Author(s): Y. Sakaguchi, et al.
  • Journal Title: J. Phys. Soc. Jpn. Volume: 85 Issue: 2 Pages: 023602-023602
  • DOI: 10.7566/jpsj.85.023602
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Unstable spin-ice order in the stuffed metallic pyrochlore Pr2+xIr2-xO7-δ (2015)
  • Author(s): D. E. MacLaughlin, O. O. Bernal, Lei Shu, Jun Ishikawa, Yosuke Matsumoto, J.-J. Wen, M. Mourigal, C. Stock, G. Ehlers, C. L. Broholm, Yo Machida, Kenta Kimura, Satoru Nakatsuji, Yasuyuki Shimura, and Toshiro Sakakibara
  • Journal Title: PHYSICAL REVIEW B Volume: 92 Issue: 5
  • DOI: 10.1103/physrevb.92.054432
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Absence of Jahn-Teller transition in the hexagonal Ba3CuSb2O9 single crystal (2015)
  • Author(s): Naoyuki Katayama, Kenta Kimura, Yibo Han, Joji Nasu, Natalia Drichko, Yoshiki Nakanishi, Mario Halim,Yuki Ishiguro, Ryuta Satake, Eiji Nishibori, Masahito Yoshizawa, Takehito Nakano, Yasuo Nozue, Yusuke Wakabayashi, Sumio Ishihara, Masayuki Hagiwara, Hiroshi Sawa, and Satoru Nakatsuji
  • Journal Title: Proc. Natl. Acad. Sci. USA Volume: 112 Issue: 30 Pages: 9305-9309
  • DOI: 10.1073/pnas.1508941112
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Conduction electron spin resonance in the α-Yb1-xFexAlB4 (0 ≤ x ≤ 0.50) and α-LuAlB4 compounds (2015)
  • Author(s): L. Holanda, G. Lesseux, E. Magnavita, R. Ribeiro, S. Nakatsuji, K. Kuga, Z. Fisk, S. Oseroff, R. Urbano, C. Rettori and P. Pagliuso
  • Journal Title: J. Phys.: Condens. Matter Volume: 27 Issue: 25 Pages: 255601-255601
  • DOI: 10.1088/0953-8984/27/25/255601
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Field Evolution of Quantum Critical and Heavy Fermi-Liquid Components in the Magnetization of the Mixed Valence Compound β-YbAlB4 (2015)
  • Author(s): Yosuke Matsumoto, Kentaro Kuga, Yoshitomo Karaki, Yasuyuki Shimura, Toshiro Sakakibara, Masashi Tokunaga, Koichi Kindo, and Satoru Nakatsuji
  • Journal Title: Journal of the Physical Society of Japan Volume: 84 Issue: 2 Pages: 024710-024710
  • DOI: 10.7566/jpsj.84.024710
  • NAID: 210000133439
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Magnetic Order in the Frustrated Ising Quasi-One Dimensional Compound NaCo(acac)3 1Benzene (2015)
  • Author(s): Y. Karaki, K. Kuga, K. Kimura, S. Nakatsuji, K. Matsubayashi and Y. Uwatoko
  • Journal Title: J. Phys. Soc. Jpn. Volume: 84 Issue: 8 Pages: 084708-084708
  • DOI: 10.7566/jpsj.84.084708
  • Peer Reviewed
• [Journal Article] Magnetization Anomaly due to the Non-Coplanar Spin Structure in NiS2 (2015)
  • Author(s): T. Higo and S. Nakatsuji
  • Journal Title: Journal of the Physical Society of Japan Volume: 84 Issue: 5 Pages: 053702-053702
  • DOI: 10.7566/jpsj.84.053702
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] X-ray Absorption Spectroscopy in the Heavy Fermion Compound α-YbAlB4 at High Magnetic Fields (2015)
  • Author(s): Taku T. Terashima, Yasuhiro H. Matsuda, Kentaro Kuga, Shintaro Suzuki, Yosuke Matsumoto, Satoru Nakatsuji, Akihiro Kondo, Koichi Kindo, Naomi Kawamura, Masaichiro Mizumaki, and Toshiya Inami,
  • Journal Title: Journal of the Physical Society of Japan Volume: 84 Issue: 11 Pages: 114715-114715
  • DOI: 10.7566/jpsj.84.114715
  • NAID: 210000133737
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Field-induced quadrupolar quantum criticality in PrV2 Al20 (2015)
  • Author(s): Y. Shimura, M. Tsujimoto, B. Zeng, L. Balicas, A. Sakai and S. Nakatsuji
  • Journal Title: Phys. Rev. B Volume: 91 Issue: 24
  • DOI: 10.1103/physrevb.91.241102
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Large trigonal-field effect on spin-orbit coupled states in a pyrochlore iridate (2015)
  • Author(s): Daisuke Uematsu, Hajime Sagayama, Taka-hisa Arima, Jun J. Ishikawa, Satoru Nakatsuji, Hidenori Takagi, Masahiro Yoshida, Jun'ichiro Mizuki, and Kenji Ishii
  • Journal Title: physical review B Volume: 92 Issue: 9
  • DOI: 10.1103/physrevb.92.094405
  • Peer Reviewed
• [Journal Article] Optical evidence for a Weyl semimetal state in pyrochlore Eu2Ir2O7 (2015)
  • Author(s): A. B. Sushkov, J. B. Hofmann, G. S. Jenkins, J. Ishikawa, S. Nakatsuji, S. Das Sarma and H. D. Drew
  • Journal Title: Phys. Rev. B Volume: 92 Issue: 24
  • DOI: 10.1103/physrevb.92.241108
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice (2015)
  • Author(s): Yusuke Nambu, Jason S. Gardner, Douglas E. MacLaughlin, Chris Stock, Hitoshi Endo, Seth Jonas, Taku J. Sato, Satoru Nakatsuji, and Collin Broholm
  • Journal Title: Phys. Rev. Lett. Volume: 115 Issue: 12
  • DOI: 10.1103/physrevlett.115.127202
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Large anomalous Hall effect in a non-collinear antiferromagnet at room temperature (2015)
  • Author(s): Nakatsuji, Satoru; Kiyohara, Naoki; Higo, Tomoya
  • Journal Title: NATURE Volume: 527 Issue: 7577 Pages: 212-215
  • DOI: 10.1038/nature15723
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] 電子軌道の量子ゆらぎによる新しい超伝導 (2015)
  • Author(s): 松本 洋介
  • Journal Title: パリティ Volume: 30-7 Pages: 2-6
  • Peer Reviewed
• [Journal Article] Unconventional Quantum Criticality in β-YbAlB4 Detached from Its Magnetically Ordered Phase (2015)
  • Author(s): T. Tomita, K. Kuga, Y. Uwatoko, P. Coleman and S. Nakatsuji
  • Journal Title: Physics Procedia Volume: 75 Pages: 482-487
  • DOI: 10.1016/j.phpro.2015.12.060
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Anisotropic transverse magnetoresistivity in α-YbAlB4 (2015)
  • Author(s): Yosuke Matsumoto, Jinpyo Hong, Kentaro Kuga and Satoru Nakatsuji
  • Journal Title: J. Phys.: Conf. Ser. Volume: 592 Pages: 012086-012086
  • DOI: 10.1088/1742-6596/592/1/012086
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Anomalous Enhancement of Seebeck Coefficient in Pr-Based 1-2-20 System with Non-Kramers Doublet Ground States (2015)
  • Author(s): Y. Machida, T. Yoshida, T. Ikeura, K. Izawa, A. Nakama, R. Higashinaka, Y. Aoki, H. Sato, A. Sakai, S. Nakatsuji, N. Nagasawa, K. Matsumoto, T. Onimaru, T. Takabatake
  • Journal Title: Journal of Physics: Conference Series Volume: 592 Pages: 0120251-9
  • DOI: 10.1088/1742-6596/592/1/012025
  • Peer Reviewed / Open Access
• [Journal Article] Anomalous specific heat behaviour in the quadrupolar Kondo system PrV2Al20 (2015)
  • Author(s): M. Tsujimoto, Y. Matsumoto and S. Nakatsuji
  • Journal Title: J. Phys.: Conf. Ser. Volume: 592 Pages: 012023-012023
  • DOI: 10.1088/1742-6596/592/1/012023
  • Peer Reviewed / Open Access
• [Journal Article] Antiferromagnetic transition of the caged compound TmTi 2 Al 20 (2015)
  • Author(s): N. Kase, Y. Shimura, S. Kittaka, T. Sakakibara, S. Nakatsuji, T. Nakano, N. Takeda and J. Akimitsu
  • Journal Title: J. Phys.: Conf. Ser. Volume: 592 Pages: 012052-012052
  • DOI: 10.1088/1742-6596/592/1/012052
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] High Pressure Measurements of the Resistivity of β -YbAlB 4 (2015)
  • Author(s): T. Tomita, K. Kuga, Y. Uwatoko and S. Nakatsuji
  • Journal Title: J. Phys.: Conf. Ser. Volume: 592 Pages: 012019-012019
  • DOI: 10.1088/1742-6596/592/1/012019
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Shubnikov-de Haas Oscillation in the cubic Γ3-based heavy fermion superconductor PrV2Al20 (2015)
  • Author(s): Yasuyuki Shimura, Masaki Tsujimoto, Akito Sakai, Bin Zeng, Luis Balicas and Satoru Nakatsuji
  • Journal Title: Journal of Physics: Conference Series Volume: 592 Pages: 012026-012026
  • DOI: 10.1088/1742-6596/592/1/012026
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Synchrotron X-ray spectroscopy study on the valence state and magnetization in α-YbAl1-xFexB4 (x = 0.115) at low temperatures and high magnetic fields (2015)
  • Author(s): T. Terashima, Y. H. Matsuda, K. Kuga, S. Suzuki, Y. Matsumoto, S. Nakatsuji, A. Kondo, K. Kindo, N. Kawamura, M. Mizumaki and T. Inami
  • Journal Title: J. Phys.: Conf. Ser. Volume: 592 Pages: 012020-012020
  • DOI: 10.1088/1742-6596/592/1/012020
  • Peer Reviewed / Open Access
• [Journal Article] Takeshi Kondo,M. Nakayama,R. Chen,J. J. Ishikawa,E.-G. Moon,T. Yamamoto,Y. Ota,W. Malaeb,H. Kanai,Y. Nakashima,Y. Ishida,R. Yoshida,H. Yamamoto,M. Matsunami,S. Kimura, N. Inami,K. Ono,H. Kumigashira,S. Nakatsuji,L. Balents& S. Shin (2015)
  • Author(s): Quadratic Fermi node in a 3D strongly correlated semimetal
  • Journal Title: Nature Communications Volume: 6 Issue: 1
  • DOI: 10.1038/ncomms10042
  • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] High-Field Multi-Frequency ESR in the Rare-Earth Spinel Compound CdYb2S4 (2015)
  • Author(s): D. Yoshizawa, T. Kida, S. Nakatsuji, K. Iritani, M. Halim, T. Takeuchi and M. Hagiwara
  • Journal Title: Appl. Magn. Reson. Volume: N/A Issue: 9 Pages: 0937-9347
  • DOI: 10.1007/s00723-015-0651-x
  • Peer Reviewed / Open Access
• [Journal Article] Quantum criticality in a metallic spin liquid (2014)
  • Author(s): Y. Tokiwa, J. J. Ishikawa, S. Nakatsuji and P. Gegenwart
  • Journal Title: Nature Mater. Volume: 13 Issue: 4 Pages: 356-359
  • DOI: 10.1038/nmat3900
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Magnetization and Specific Heat of the Cage Compound PrV2Al20 (2014)
  • Author(s): K. Araki, Y. Shimura, N. Kase, T. Sakakibara, A. Sakai, S. Nakatsuji
  • Journal Title: JPS Conf. Proc. Volume: 3 Pages: 011093-011093
  • DOI: 10.7566/jpscp.3.011093
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Magnetic and Thermal Properties of the Single Crystalline Pr2Zr2O7 in a [111] field (2014)
  • Author(s): K. Kimura and S. Nakatsuji
  • Journal Title: JPS Conf. Proc Volume: 3
  • DOI: 10.7566/jpscp.3.014027
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] X-ray Photoemission and X-ray Absorption Spectroscopy of Hexagonal Ba3CuSb2O9 (2014)
  • Author(s): T. Sugimoto, T. Mizokawa, H. Wadati, K. Takubo, A. Damascelli, T. Z. Regier, G. A. Sawatzky, N. Katayama, H. Sawa, K. Kimura and S. Nakatsuji, J. Kor
  • Journal Title: J. Phys. Soc. Jpn. Volume: 63 Pages: 549-550
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] 銅酸化物磁性体におけるスピン・軌道の特異な量子状態 (2014)
  • Author(s): 澤 博, 中辻 知
  • Journal Title: 固体物理 Volume: 49 Pages: 533-543
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Heavy-Fermion Superconductivity in the Quadrupole Ordered State of PrV2Al20 (2014)
  • Author(s): M. Tsujimoto, Y. Matsumoto, T. Tomita, A. Sakai and S. Nakatsuji
  • Journal Title: Phys. Rev. Lett Volume: 113 Issue: 26 Pages: 267001-267001
  • DOI: 10.1103/physrevlett.113.267001
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Experimental realization of a quantum breathing pyrochlore antiferromagnet (2014)
  • Author(s): K. Kimura, S. Nakatsuji and T. Kimura
  • Journal Title: Phys. Rev. B Volume: 90 Issue: 6 Pages: 060414-060414
  • DOI: 10.1103/physrevb.90.060414
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Two magnetic phases in α-YbAl1-xFexB4 (2014)
  • Author(s): K. Kuga, S. Suzuki and S. Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3
  • DOI: 10.7566/jpscp.3.012013
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Suppression of the Heavy Fermion State in Magnetic Fields in the Mixed Valent α-YbAlB4 (2014)
  • Author(s): Y. Matsumoto, K. Kentaro and S. Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3
  • DOI: 10.7566/jpscp.3.011076
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Superconducting properties of the ferroquadrupolar cubic Γ3 compound PrTi2Al20 (2014)
  • Author(s): A. Sakai, K. Kuga and S. Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3
  • DOI: 10.7566/jpscp.3.011066
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Structural and Magnetic Properties of α―Yb(Al1-xFex)B4 under Hydtostatic Pressure (2014)
  • Author(s): Y. Sakaguchi, S. Ikeda, K. Kuga, S. Nakatsuji, N. Hirao, Y. Ohishi and H. Kobayashi
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3
  • DOI: 10.7566/jpscp.3.011059
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Sample Dependence of the Quadrupolar Transition in the Nonmagnetic cubic Γ3 Compound PrV2Al20 (2014)
  • Author(s): M. Tsujimoto, A. Sakai and S. Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3
  • DOI: 10.7566/jpscp.3.011074
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Magnetization of Yb-based mixed-valent compounds at megagauss fields (2014)
  • Author(s): T. Terashima, Y. H. Matsuda, K. Kuga, Y. Matsumoto and S. Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3
  • DOI: 10.7566/jpscp.3.011027
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Electronic Structure of Quantum Spin-liquid Coupound Ba3CuSb2O9 (2014)
  • Author(s): T. Sugimoto, T. Mizokawa, H. Wadati, K. Takubo, A. Damascelli, T. Z. Regier, G. A. Sawatzky, N. Katayama, H. Sawa, K. Kimura and S. Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 3 Pages: 1-4
  • DOI: 10.7566/jpscp.3.014007
  • Peer Reviewed / Open Access
• [Journal Article] Chemical effects of high-resolution YbLγ4 emission spectra: a possible probe for chemical analysis (2013)
  • Author(s): Hisashi Hayashi, Noriko Kanai, Naomi Kawamura, Yasuhiro H. Matsuda, Kentaro Kuga, Satoru Nakatsuji, Tetsuro Yamashita, and Shigeo Ohara
  • Journal Title: X-Ray Spectrom. Volume: 42 Issue: 6 Pages: 450-455
  • DOI: 10.1002/xrs.2502
  • Peer Reviewed
• [Journal Article] Synchrotron X-ray Spectroscopy Study on the Valence State in α-and β-YbAlB_4 at Low Temperatures and High Magnetic Fields (2013)
  • Author(s): Y. H. Matsuda, T. Nakamura, K. Kuga, S. Nakatsuji, S. Michimura, T. Inami, N. Kawamura and M. Mizumaki
  • Journal Title: Journal of the Korean Physical Society Volume: Vol. 62, No. 12 Issue: 12 Pages: 1778-1781
  • DOI: 10.3938/jkps.62.1778
  • Peer Reviewed
• [Journal Article] Single-crystal study on the low-temperature magnetism of the pyrochlore magnet Pr2Zr2O7: (2013)
  • Author(s): K. Kimura, S. Nakatsuji and A. A. Nugroho
  • Journal Title: Journal of the Korean Physical Society Volume: 63 Issue: 3 Pages: 719-721
  • DOI: 10.3938/jkps.63.719
  • Peer Reviewed
• [Journal Article] Mossbauer spectroscopy of Fe-doped valence-fluctuating α-YbAlB4 (2013)
  • Author(s): Y. Sakaguchi, S. Ikeda, H. Kobayashi, K. Kuga, K. Sone and S. Nakatsuji
  • Journal Title: Journal of the Korean Physical Society Volume: 62 Issue: 12 Pages: 2146-2149
  • DOI: 10.3938/jkps.62.2146
  • Peer Reviewed
• [Journal Article] Low-temperature Transport Properties of the Quadrupolar Kondo Lattice System PrTi_2Al_<20> (2013)
  • Author(s): A. Sakai and S. Nakatsuji
  • Journal Title: J. Korea Phys. Soc. Volume: 63 Issue: 3 Pages: 398-398
  • DOI: 10.3938/jkps.63.398
  • Peer Reviewed
• [Journal Article] Quantum fluctuations in spin-ice-like Pr2Zr2O7 (2013)
  • Author(s): K. Kimura, S. Nakatsuji, J-J. Wen, C. Broholm, M. B. Stone, E. Nishibori and H. Sawa
  • Journal Title: Nature Communications Volume: 4 Issue: 1 Pages: 1-19
  • DOI: 10.1038/ncomms2914
  • Peer Reviewed
• [Journal Article] Dynamical spin-orbital correlation in the frustrated magnet Ba_3CuSb_2O_9 (2013)
  • Author(s): Y. Ishiguro, K. Kimura, S. Nakatsuji, S. Tsutsui, A. Q. R. Baron T. Kimura, and Y. Wakabayashi
  • Journal Title: Nature Commun Volume: 4 Issue: 1
  • DOI: 10.1038/ncomms3022
  • Peer Reviewed
• [Journal Article] 銅酸化物における乱れに強い量子液体状態 (2013)
  • Author(s): 中辻 知, 澤 博
  • Journal Title: 「超伝導現象と高温超伝導体」, 新日本編集企画, NTS出版社 Volume: 1 Pages: 475-481
  • Peer Reviewed
• [Journal Article] Magnetic excitations and c-f hybridization effect in PrTi2Al20 and PrV2Al20 (2013)
  • Author(s): Y. Tokunaga, H. Sakai, S. Kambe, A. Sakai, S. Nakatsuji and H. Harima
  • Journal Title: Phys. Rev. B Volume: 88 Issue: 8
  • DOI: 10.1103/physrevb.88.085124
  • Peer Reviewed
• [Journal Article] Determination of long-range all-in-all-out ordering of Ir4+ moments in a pyrochlore iridate Eu2Ir2O7 by resonant x-ray diffraction (2013)
  • Author(s): H. Sagayama, D. Uematsu, T. Arima, K. Sugimoto, J. J. Ishikawa, E. O'Farrell, S. Nakatsuji
  • Journal Title: Physical Review B Volume: 87 Issue: 10
  • DOI: 10.1103/physrevb.87.100403
  • Peer Reviewed
• [Journal Article] Evidence of a High-Field Phase in PrV2Al20 1n a[100]Magnetic Field (2013)
  • Author(s): Y, Shimura, Y, Ohta, T, Sakakibara, A, Sakai, and S, Nakatsuji
  • Journal Title: J. Phys. Soc. Jpn. Volume: 82 Issue: 4 Pages: 43705-43709
  • DOI: 10.7566/jpsj.82.043705
  • Peer Reviewed
• [Journal Article] Conduction electron spin resonance in AlB 2 (2013)
  • Author(s): L. M. Holanda, L. Mendonca-Ferreira, R. A. Ribeiro, J. M. Osorio-Guillen, G. M. Dalpian, K. Kuga, S. Nakatsuji, Z. Fisk, R. R. Urbano, P. G. Pagliuso and C. Rettori
  • Journal Title: J. Phys.: Condens. Matter Volume: 25 Issue: 21 Pages: 216001-216001
  • DOI: 10.1088/0953-8984/25/21/216001
  • Peer Reviewed
• [Presentation] Heavy fermion superconductivity under strong orbital fluctuations in PrV2Al20 (2016)
  • Author(s): 松本洋介
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県・仙台市）
  • Year and Date: 2016-03-19
  • Invited
• [Presentation] PrV2Al20の磁気熱量測定による軌道ゆらぎ量子臨界性 (2016)
  • Author(s): 辻本真規, 酒井明人, Philipp Gegenwart, 眞方篤史, 松本洋介, 中辻知
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県・仙台市）
  • Year and Date: 2016-03-19
• [Presentation] 温熱膨張・磁歪測定によるPrTi2Al20の混成効果の検証 (2016)
  • Author(s): 眞方篤史, 松本洋介, 辻本真規, 酒井明人A, 冨田崇弘, 中辻知
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県・仙台市）
  • Year and Date: 2016-03-19
• [Presentation] 低温熱膨張・磁歪測定によるPrTi2Al20の混成効果の検証 (2016)
  • Author(s): 眞方篤史, 松本洋介, 辻本真規, 酒井明人, 冨田崇弘, 中辻知
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県・仙台市）
  • Year and Date: 2016-03-19
• [Presentation] 反強磁性金属Mn3X (X =Sn, Ge) の室温巨大異常ホール効果 (2016)
  • Author(s): 冨田崇弘，清原直樹、M. Ikhlas、中辻知
  • Organizer: 日本物理学会第71回年次大会
  • Place of Presentation: 東北学院大学（宮城県・仙台市）
  • Year and Date: 2016-03-19
• [Presentation] Optical evidence for a Weyl semimetal state in pyrochlore Eu2Ir2O7 (2016)
  • Author(s): S. Nakatsuji
  • Organizer: アメリカ物理学会 March Meeting 2016
  • Place of Presentation: ジョンズホプキンス大学(米国・ボルチモア）
  • Year and Date: 2016-03-14
  • Int'l Joint Research / Invited
• [Presentation] Heavy fermion superconductivity under strong orbital fluctuations in PrV2Al20 (2016)
  • Author(s): Y. Matsumoto, M. Tsujimoto, T. Tomita, A. Sakai and S. Nakatsuji
  • Organizer: アメリカ物理学会 March Meeting 2016
  • Place of Presentation: ジョンズホプキンス大学(米国・ボルチモア）
  • Year and Date: 2016-03-14
  • Int'l Joint Research
• [Presentation] Heavy fermion superconductivity and multipolar ordered states in PrT2Al20 (T = Ti, V) (2016)
  • Author(s): Y. Matsumoto
  • Organizer: Anomalous Transport in Multipolar and Topological Materials
  • Place of Presentation: Mt. Washington Conference center（米国・ボルチモア）
  • Year and Date: 2016-03-11
  • Int'l Joint Research / Invited
• [Presentation] Novel quantum and functional phases in correlated electron systems: from spin liquids to anomalous Hall effect in chiral antiferromagn (2016)
  • Author(s): S. Nakatsuji
  • Organizer: マックスプランク複雑系物理学研究所/物性研究所共催・国際ワークショップ
  • Place of Presentation: マックスプランク複雑系物理学研究所MPI-PKS(ドイツ・ドレスデン）
  • Year and Date: 2016-02-27
  • Int'l Joint Research / Invited
• [Presentation] Strange Metal Phase Detached from the Magnetic Criticality in -YbAlB4 (2016)
  • Author(s): 冨田崇弘
  • Organizer: マックスプランク複雑系物理学研究所/物性研究所共催・国際ワークショップ
  • Place of Presentation: マックスプランク複雑系物理学研究所MPI-PKS(ドイツ・ドレスデン）
  • Year and Date: 2016-02-27
  • Int'l Joint Research / Invited
• [Presentation] Field-Induced Quadrupolar Quantum Critical Phenomena in PrV2Al20 (2016)
  • Author(s): Y. Shimura, M. Tsujimoto, Bin Zeng, Qiu Zhang, Luis Balicas, A. Sakai, S. Nakatsuji
  • Organizer: マックスプランク複雑系物理学研究所/物性研究所共催・国際ワークショップ
  • Place of Presentation: マックスプランク複雑系物理学研究所MPI-PKS(ドイツ・ドレスデン）
  • Year and Date: 2016-02-27
  • Int'l Joint Research
• [Presentation] Novel quantum criticality under strong valence fluctuations in YbAlB4 (2015)
  • Author(s): Y. Matsumoto, T. Tomita, K. Kuga, Eoin C. T. O’Farrell, Y. Shimura and S. Nakatsuji
  • Organizer: Toyota RIKEN International Workshop 2015
  • Place of Presentation: 名古屋大学（愛知県・名古屋市）
  • Year and Date: 2015-11-17
  • Int'l Joint Research / Invited
• [Presentation] パイロクロア型イリジウム酸化物における低温下の熱膨張と熱電能測定 (2015)
  • Author(s): 冨田崇弘，鈴木慎太郎、Robert K¨uchler、Kamran Benia、Zhaoming Tian、松本洋介、中辻知
  • Organizer: 第9 回物性科学領域横断研究会 凝縮系科学の最前線
  • Place of Presentation: 東京大学小柴ホール（東京都・文京区）
  • Year and Date: 2015-11-13
• [Presentation] Field-Induced Quadrupolar Quantum Criticality in the Heavy Fermion Superconductor PrV2Al20 (2015)
  • Author(s): Y. Shimura, M. Tsujimoto, Bin Zeng, Qiu Zhang, Luis Balicas, A. Sakai, S. Nakatsuji
  • Organizer: 首都大学東京 International Symposium 2015 "New Quantum Phases Emerging from Novel Crystal Structure"
  • Place of Presentation: 首都大学東京（東京都・八王子市）
  • Year and Date: 2015-09-24
  • Int'l Joint Research
• [Presentation] Heavy fermion superconductivity in a multipolar ordered state of PrV2Al20 (2015)
  • Author(s): Y. Matsumoto, M. Tsujimoto, T. Tomita, A. Sakai and S. Nakatsuji
  • Organizer: 首都大学東京 International Symposium 2015 "New Quantum Phases Emerging from Novel Crystal Structure"
  • Place of Presentation: 首都大学東京（東京都・八王子市）
  • Year and Date: 2015-09-24
  • Int'l Joint Research / Invited
• [Presentation] 籠状物質PrV2Al20における多極子2段転移と重い電子超伝導 (2015)
  • Author(s): 松本洋介
  • 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（大阪府・吹田市）
  • Year and Date: 2015-09-16
  • Invited
• [Presentation] PrTi2Al20における四極子秩序相とダイナミクスのNMRによる研究 (2015)
  • Author(s): 谷口貴紀, 吉田誠, 武田晃, 瀧川仁, 辻本真規, 松本洋介, 中辻知
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] Ba3CuSb2O9の熱輸送特性 (2015)
  • Author(s): 杉井かおり, 下澤雅明, 渡邊大樹, 鈴木喜貴, 木俣基, Mario Halim, 松本洋介, 中辻知, 鳥塚潔, 上床美也, 山下穣
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] α-YbAl1-xMnxB4の電子構造 (2015)
  • Author(s): 田久保耕, 津山智之, 平田靖透, Bareille Cedric, 辛埴, 山本真吾, 松田巌, 伊奈稔哲A, 新田清文A, 水牧仁一朗A, 鈴木慎太郎, 松本洋介, 中辻知, 和達大樹
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] 極低温熱膨張、磁歪測定による価数揺動系α-YbAlB4の磁場誘起量子臨界現象の研究 (2015)
  • Author(s): 松本洋介, 眞方篤史, 志村恭通, 冨田崇弘, Robert Kuchler, Manuel Brando, 中辻知
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] パイロクロア型イリジウム酸化物における低温下の熱膨張と熱電能測定 (2015)
  • Author(s): 冨田崇弘, 鈴木慎太郎, Robert Kuchler, Kamran Behnia, Zhaoming Tian, 松本洋介, 中辻知
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] 非磁性カゴ状物質PrTr2Al20(Tr = 遷移金属)における低温での熱膨張及び磁歪測定 (2015)
  • Author(s): 眞方篤史, 松本洋介, 辻本真規, 冨田崇弘, 中辻知
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] PrV2Al20における極低温磁気抵抗効果と異方的磁気相図 (2015)
  • Author(s): 志村 恭通、辻本 真規、Bin Zeng, Qiu Zhang, Luis Balicas, 酒井 明人, 中辻 知
  • Organizer: 日本物理学会2015年秋季大会
  • Place of Presentation: 関西大学（大阪府・吹田市）
  • Year and Date: 2015-09-16
• [Presentation] パイロクロア型イリジウム酸化物における低温下の熱膨張と熱電能測定 (2015)
  • Author(s): 冨田崇弘，鈴木慎太郎、Robert K¨uchler、Kamran Benia、Zhaoming Tian、松本洋介、中辻知,
  • Organizer: J-Physics：多極子伝導系の物理キックオフミーティング
  • Place of Presentation: 神戸大学総合拠点コンベンションホール(兵庫県・神戸市)
  • Year and Date: 2015-09-14
• [Presentation] Heavy fermion superconductivity and strong orbital fluctuations in PrV2Al20 (2015)
  • Author(s): Yosuke Matsumoto, M. Tsujimoto, T. Tomita, A. Sakai and S. Nakatsuji
  • Organizer: School and Workshop on Strongly Correlated Electronic Systems - Novel Materials and Novel Theories
  • Place of Presentation: 国際理論物理学センター （イタリア・トリエステ）
  • Year and Date: 2015-08-10
  • Int'l Joint Research / Invited
• [Presentation] Fermi node, chiral spin liquid, and quantum metal-insulator transition in correlated semimetals (2015)
  • Author(s): S. Nakatsuji
  • Organizer: カブリ理論物理学研究所 Conference
  • Place of Presentation: カリフォルニア大学サンタバーバラ校 カブリ理論物理学研究所 (米国・サンタバーバラ）
  • Year and Date: 2015-07-28
  • Int'l Joint Research / Invited
• [Presentation] Heavy fermion superconductivity and double multipolar transition in PrV2Al20 (2015)
  • Author(s): Y. Matsumoto, M. Tsujimoto, A. Sakai, T. Tomita, S. Nakatsuji
  • Organizer: 20th international conference on magnetism (ICM2015)
  • Place of Presentation: Palau de Congressos de Catalunya and Hotel（スペイン・バルセロナ）
  • Year and Date: 2015-07-05
  • Int'l Joint Research
• [Presentation] 非磁性籠状物質PrV2Al20 における重い電子超伝導 -電子軌道の量子揺らぎによる新しい超伝導 (2015)
  • Author(s): 松本洋介
  • Organizer: 基研研究会「多自由度と相関効果が生み出す超伝導の新潮流 ～BCSからBECまで～」
  • Place of Presentation: 京都大学基礎物理学研究所（京都府・京都市）
  • Year and Date: 2015-06-09
  • Invited
• [Presentation] Novel Quantum Criticality in Valence Fluctuating YbAlB4 Systems and Its Topological Aspects (2015)
  • Author(s): Y. Matsumoto, T. Tomita, K. Kuga, Eoin C. T. O’Farrell, Y. Shimura and S. Nakatsuji
  • Organizer: Strongly Correlated Topological Insulators: SmB6 and Beyond
  • Place of Presentation: ミシガン大学(米国・ミシガン）
  • Year and Date: 2015-06-02
  • Int'l Joint Research / Invited
• [Presentation] Unconventional quantum criticality in valence fluctuating YbAlB4 (2015)
  • Author(s): Y. Matsumoto, T. Tomita, K.Kuga, Eoin C. T. O’Farrell, Y. Shimura and S. Nakatsuji
  • Organizer: 韓国物理学会 Spring Meeting 2015
  • Place of Presentation: DaejeonConvention Center(韓国・Daejeon)
  • Year and Date: 2015-04-22
  • Int'l Joint Research / Invited
• [Presentation] 強相関電子系におけるトポロジー - YbAlB4における例 (2015)
  • Author(s): 松本洋介
  • Organizer: 走査プローブ顕微鏡を用いた先端計測でアプローチする物性研究 第一回研究会
  • Place of Presentation: 東京大学物性研究所（千葉県・柏市）
  • Year and Date: 2015-04-13
  • Invited
• [Presentation] “Strange metal without magnetic instability in β-YbAlB4” (2015)
  • Author(s): S. Nakatsuji
  • Organizer: American Physical Society March Meeting, Invited Session: Emergent Quantum Phases and Their Transitions in Correlated Electron Systems
  • Place of Presentation: San Antonio, Texas, USA
  • Year and Date: 2015-03-02 – 2015-03-06
  • Invited
• [Presentation] “Quantum Melting of Spin Ice” (2015)
  • Author(s): S. Nakatsuji
  • Organizer: Edgar Luscher Seminar 2015 “Neues aus der Festkorperphysik”
  • Place of Presentation: Hotel-Sport Klosters/Schweiz, Switzerland
  • Year and Date: 2015-02-07 – 2015-02-13
  • Invited
• [Presentation] “Orbital Ordering and Heavy Fermion Superconductivity in PrTr2Al20” (2014)
  • Author(s): S. Nakatsuji
  • Organizer: 2014 Autumn Meeting of Japanese Physical Society, Symposium “Next Generation of Heavy Electron Materials”
  • Place of Presentation: Chubu Univ. Japan
  • Year and Date: 2014-09-07 – 2014-09-10
  • Invited
• [Presentation] “Anomalous Metal and Unconventional Superconductivity in the quadrupolar Kondo system PrTr2Al20 (Tr = Ti, V)” (2014)
  • Author(s): S. Nakatsuji
  • Organizer: 13th Bilateral German-Japanese Symposium on “Interplay of Spin- and Orbital Degrees of Freedom in Strongly Correlated Electron Systems”
  • Place of Presentation: Ringberg Castle, Rottach-Egern, Germany
  • Year and Date: 2014-07-13 – 2014-07-16
  • Invited
• [Presentation] “Emergent excitations in spin liquids through coupling with electrons and orbitals”(基調講演） (2014)
  • Author(s): S. Nakatsuji
  • Organizer: 7th International Conference on Highly Frustrated Magnetism 2014(基調講演）
  • Place of Presentation: Cambridge University, UK
  • Year and Date: 2014-07-07 – 2014-07-11
• [Presentation] "Emergent Non-Fermi-Liquid Phases Without Magnetic Criticality" (2014)
  • Author(s): S. Nakatsuji
  • Organizer: Gordon Research Conference, “Correlated Electron Systems: Textures, Topology, and Strong Interactions”
  • Place of Presentation: Mount Holyoke College, South Hadley MA, USA
  • Year and Date: 2014-06-22 – 2014-06-27
  • Invited
• [Presentation] “Strange metal without magnetic criticality” (2014)
  • Author(s): S. Nakatsuji
  • Organizer: Aspen Summer Workshop 2014 “Modern Trends in Quantum Magnetism”
  • Place of Presentation: Aspen Center for Physics, Aspen CO, USA
  • Year and Date: 2014-05-25 – 2014-06-22
  • Invited
• [Presentation] “Topological excitations and anomalous semi-metallic phase in Pr based pyrochlore oxides” (2014)
  • Author(s): S. Nakatsuji
  • Organizer: OIST International Workshp on Novel Quantum Materials and Phases
  • Place of Presentation: OIST, Okinawa, Japan
  • Year and Date: 2014-05-13 – 2014-05-17
  • Invited
• [Presentation] “Quantum Fluctuations, Chirality Anomalous Metallic Behavior in Pr2Tr2O7” (2014)
  • Author(s): S. Nakatsuji
  • Organizer: Workshop on Frustration and Topology in Condensed Matter Physics
  • Place of Presentation: National Cheng Kung University, Tainan
  • Invited
• [Presentation] Quantum Fluctuations, Chirality and Anomalous Metallic Behavior in Spin Ices (2013)
  • Author(s): S. Nakatsuji
  • Organizer: APCTP workshop "Bad Metal Behavior and Mott Quantum Criticality"
  • Place of Presentation: Pohang, Korea
  • Invited
• [Presentation] Quantum Fluctuations and Anomalous Semi-metallic Behavior in Pr based Spin Ices (2013)
  • Author(s): S. Nakatsuji
  • Organizer: International Workshop on “Spin Orbit Entanglement: Exotic States of Quantum Matter in Electronic Systems”
  • Place of Presentation: Max Planck Institute for the Physics of Complex Systems, Dresden, Germany
  • Invited
• [Presentation] “Quantum Fluctuations and Quantum Criticality in Pr-based Spin Ice Materials” (2013)
  • Author(s): S. Nakatsuji
  • Organizer: Autumn Meeting of Japanese Physical Society, Symposium “QED in Magnetism: Quantum Spin Ice”
  • Place of Presentation: Tokushima Univ. Japan
  • Invited
• [Presentation] “Anomalous metallic phases without magnetic criticality” (2013)
  • Author(s): S. Nakatsuji
  • Organizer: International Conference on conference on "Quantum Criticality: Experiment and Theory"
  • Place of Presentation: Freudenstadt-Lauterbad, Germany
  • Invited
• [Presentation] “Quantum fluctuations, spin chirality, and anomalous metal phase in spin ice materials” (2013)
  • Author(s): S. Nakatsuji
  • Organizer: CIFAR Quantum Materials Program Meeting,
  • Place of Presentation: Vancouver, Canada
  • Invited