Spin excitations in the kagome-lattice metallic antiferromagnet Fe0.89Co0.11Sn

被引：5

作者：

Xie, Tao ^{[1
]}

Yin, Qiangwei ^{[2
,3
]}

Wang, Qi ^{[2
,3
]}

Kolesnikov, A. I. ^{[1
]}

Granroth, G. E. ^{[1
]}

Abernathy, D. L. ^{[1
]}

Gong, Dongliang ^{[4
]}

Yin, Zhiping ^{[5
,6
]}

Lei, Hechang ^{[2
,3
]}

Podlesnyak, A. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA

[2] Renmin Univ China, Lab Neutron Scattering, Beijing 100872, Peoples R China

[3] Renmin Univ China, Dept Phys, Beijing Key Lab Optoelect Funct Mat MicroNano Devi, Beijing 100872, Peoples R China

[4] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA

[5] Beijing Normal Univ, Ctr Adv Quantum Studies, Beijing 100875, Peoples R China

[6] Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China

来源：

PHYSICAL REVIEW B | 2022年 / 106卷 / 21期

基金：

中国国家自然科学基金; 国家重点研发计划; 北京市自然科学基金;

关键词：

EXCHANGE INTERACTIONS; NEUTRON-SCATTERING;

D O I：

10.1103/PhysRevB.106.214436

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Kagome-lattice materials have attracted tremendous interest due to the broad prospect for seeking supercon-ductivity, quantum spin liquid states, and topological electronic structures. Among them, the transition-metal kagome lattices are high-profile objects for the combination of topological properties, rich magnetism, and multiple-orbital physics. Here we report an inelastic neutron scattering study on the spin dynamics of a kagome-lattice antiferromagnetic metal Fe0.89Co0.11Sn. Although the magnetic excitations can be observed up to -250 meV, well-defined spin waves are only identified below -90 meV and can be modeled using Heisenberg exchange with ferromagnetic in-plane nearest-neighbor coupling J1, in-plane next-nearest-neighbor coupling J2, and antiferromagnetic (AFM) interlayer coupling Jc under linear spin-wave theory. Above -90 meV, the spin waves enter the itinerant Stoner continuum and become highly damped particle-hole excitations. At the K point of the Brillouin zone, we reveal a possible band crossing of the spin wave, which indicates a potential Dirac magnon. Our results uncover the evolution of the spin excitations from the planar AFM state to the axial AFM state in Fe0.89Co0.11Sn, solve the magnetic Hamiltonian for both states, and confirm the significant influence of the itinerant magnetism on the spin excitations.

引用

页数：11