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.
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页数：6
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