Spin excitations in metallic kagome lattice FeSn and CoSn

Xie, Yaofeng; Chen, Lebing; Chen, Tong; Wang, Qi; Yin, Qiangwei; Stewart, J. Ross; Stone, Matthew B.; Daemen, Luke L.; Feng, Erxi; Cao, Huibo; Lei, Hechang; Yin, Zhiping; MacDonald, Allan H.; Dai, Pengcheng

doi:10.1038/s42005-021-00736-8

Spin excitations in metallic kagome lattice FeSn and CoSn

Journal Article · Thu Nov 11 00:00:00 EST 2021 · Communications Physics

DOI:https://doi.org/10.1038/s42005-021-00736-8· OSTI ID:1997818

Xie, Yaofeng ^[1]; Chen, Lebing ^[1]; Chen, Tong ^[1]; Wang, Qi ^[2]; Yin, Qiangwei ^[2]; ^[3]; ^[4]; Daemen, Luke L. ^[4]; Feng, Erxi ^[4]; ^[4]; ^[2]; Yin, Zhiping ^[5]; ^[6]; ^[1]

Rice Univ., Houston, TX (United States)
Renmin University of China, Beijing (China)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Beijing Normal University, Beijing (China). Center for Advanced Quantum Studies
Univ. of Texas, Austin, TX (United States)

In two-dimensional (2D) metallic kagome lattice materials, destructive interference of electronic hopping pathways around the kagome bracket can produce nearly localized electrons, and thus electronic bands that are flat in momentum space. When ferromagnetic order breaks the degeneracy of the electronic bands and splits them into the spin-up majority and spin-down minority electronic bands, quasiparticle excitations between the spin-up and spin-down flat bands should form a narrow localized spin-excitation Stoner continuum coexisting with well-defined spin waves in the long wavelengths. Here we report inelastic neutron scattering studies of spin excitations in 2D metallic kagome lattice antiferromagnetic FeSn and paramagnetic CoSn, where angle resolved photoemission spectroscopy experiments found spin-polarized and nonpolarized flat bands, respectively, below the Fermi level. Our measurements on FeSn and CoSn reveal well-defined spin waves extending above 140 meV and correlated paramagnetic scattering around Γ point below 90 meV, respectively. In addition, we observed non-dispersive excitations at ~170 meV and ~360 meV arising mostly from hydrocarbon scattering of the CYTOP-M used to glue the samples to aluminum holder. Therefore, our results established the evolution of spin excitations in FeSn and CoSn, and identified anomalous flat modes overlooked by the neutron scattering community for many years.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rice Univ., Houston, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012311

OSTI ID:: 1997818

Journal Information:: Communications Physics, Journal Name: Communications Physics Journal Issue: 1 Vol. 4; ISSN 2399-3650

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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