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

页数：6

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