Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9

被引：91
|
作者：
Ito, Saya [1 ]
Kurita, Nobuyuki [1 ]
Tanaka, Hidekazu [1 ]
Ohira-Kawamura, Seiko [2 ]
Nakajima, Kenji [2 ]
Itoh, Shinichi [3 ]
Kuwahara, Keitaro [4 ]
Kakurai, Kazuhisa [5 ]
机构：
[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[2] J PARC Ctr, Mat & Life Sci Div, Tokai, Ibaraki 3191195, Japan
[3] High Energy Accelerator Res Org, Inst Mat Struct Sci, Neutron Sci Div, Tsukuba, Ibaraki 3050801, Japan
[4] Ibaraki Univ, Inst Quantum Beam Sci, Mito, Ibaraki 3108512, Japan
[5] CROSS, Tokai, Ibaraki 3191106, Japan
来源：
NATURE COMMUNICATIONS | 2017年 / 8卷
基金：
日本学术振兴会;
关键词：
DYNAMICS; ORDER;
D O I：
10.1038/s41467-017-00316-x
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
A spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLHAF) is a prototypical frustrated quantum magnet, which exhibits remarkable quantum many-body effects that arise from the synergy between spin frustration and quantum fluctuation. The ground-state properties of a spin-1/2 TLHAF are theoretically well understood. However, the theoretical consensus regarding the magnetic excitations is limited. The experimental study of the magnetic excitations in spin-1/2 TLHAFs has also been limited. Here we show the structure of magnetic excitations in the spin-1/2 TLHAF Ba3CoSb2O9 investigated by inelastic neutron scattering. Significantly different from theoretical expectations, the excitation spectrum has a three-stage energy structure. The lowest-energy first stage is composed of dispersion branches of single-magnon excitations. The second and third stages are dispersive continua accompanied by a columnar continuum extending above 10 meV, which is six times larger than the exchange interaction J = 1.67 meV. Our results indicate the shortcomings of the current theoretical framework.
引用
收藏
页数：6
相关论文
共 50 条
  • [1] Structure of the magnetic excitations in the spin-1/2 triangular-lattice Heisenberg antiferromagnet Ba3CoSb2O9
    Saya Ito
    Nobuyuki Kurita
    Hidekazu Tanaka
    Seiko Ohira-Kawamura
    Kenji Nakajima
    Shinichi Itoh
    Keitaro Kuwahara
    Kazuhisa Kakurai
    Nature Communications, 8
  • [2] Magnetization Process and Collective Excitations in the S=1/2 Triangular-Lattice Heisenberg Antiferromagnet Ba3CoSb2O9
    Susuki, Takuya
    Kurita, Nobuyuki
    Tanaka, Takuya
    Nojiri, Hiroyuki
    Matsuo, Akira
    Kindo, Koichi
    Tanaka, Hidekazu
    PHYSICAL REVIEW LETTERS, 2013, 110 (26)
  • [3] Static and Dynamical Properties of the Spin-1/2 Equilateral Triangular-Lattice Antiferromagnet Ba3CoSb2O9
    Ma, J.
    Kamiya, Y.
    Hong, Tao
    Cao, H. B.
    Ehlers, G.
    Tian, W.
    Batista, C. D.
    Dun, Z. L.
    Zhou, H. D.
    Matsuda, M.
    PHYSICAL REVIEW LETTERS, 2016, 116 (08)
  • [4] Thermal Conductivity in the Triangular-Lattice Antiferromagnet Ba3CoSb2O9
    Naruse, K.
    Kawamata, T.
    Ohno, M.
    Matsuoka, Y.
    Sudo, H.
    Nagasawa, H.
    Hagiya, Y.
    Sasaki, T.
    Koike, Y.
    27TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT27), PTS 1-5, 2014, 568
  • [5] Crystal growth of the triangular-lattice antiferromagnet Ba3CoSb2O9
    Prabhakaran, D.
    Boothroyd, A. T.
    JOURNAL OF CRYSTAL GROWTH, 2017, 468 : 345 - 348
  • [6] Evolution of magnetic field induced ordering in the layered quantum Heisenberg triangular-lattice antiferromagnet Ba3CoSb2O9
    Fortune, N. A.
    Huang, Q.
    Hong, T.
    Ma, J.
    Choi, E. S.
    Hannahs, S. T.
    Zhao, Z. Y.
    Sun, X. F.
    Takano, Y.
    Zhou, H. D.
    PHYSICAL REVIEW B, 2021, 103 (18)
  • [7] Quantum phase diagram of the S=1/2 triangular-lattice antiferromagnet Ba3CoSb2O9
    Koutroulakis, G.
    Zhou, T.
    Kamiya, Y.
    Thompson, J. D.
    Zhou, H. D.
    Batista, C. D.
    Brown, S. E.
    PHYSICAL REVIEW B, 2015, 91 (02)
  • [8] Resonating valence bond theory of anomalous spin dynamics of spin-1/2 triangular lattice Heisenberg antiferromagnet and its application to Ba3CoSb2O9
    Zhang, Chun
    Li, Tao
    PHYSICAL REVIEW B, 2020, 102 (07)
  • [9] Microscopic evidence of a quantum magnetization process in the S=1/2 triangular-lattice Heisenberg-like antiferromagnet Ba3CoSb2O9
    Liu, X. Z.
    Prokhnenko, O.
    Yamamoto, D.
    Bartkowiak, M.
    Kurita, N.
    Tanaka, H.
    PHYSICAL REVIEW B, 2019, 100 (09)
  • [10] Successive Phase Transitions and Extended Spin-Excitation Continuum in the S=1/2 Triangular-Lattice Antiferromagnet Ba3CoSb2O9
    Zhou, H. D.
    Xu, Cenke
    Hallas, A. M.
    Silverstein, H. J.
    Wiebe, C. R.
    Umegaki, I.
    Yan, J. Q.
    Murphy, T. P.
    Park, J. -H.
    Qiu, Y.
    Copley, J. R. D.
    Gardner, J. S.
    Takano, Y.
    PHYSICAL REVIEW LETTERS, 2012, 109 (26)
12345