Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}

Triangular lattice of rare-earth ions with interacting effective spin-1/2 local moments is an ideal platform to explore the physics of quantum spin liquids (QSLs) in the presence of strong spin-orbit coupling, crystal electric fields, and geometrical frustration. The Yb delafossites, NaYbCh_{2} (Ch=...

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Autores principales: Peng-Ling Dai, Gaoning Zhang, Yaofeng Xie, Chunruo Duan, Yonghao Gao, Zihao Zhu, Erxi Feng, Zhen Tao, Chien-Lung Huang, Huibo Cao, Andrey Podlesnyak, Garrett E. Granroth, Michelle S. Everett, Joerg C. Neuefeind, David Voneshen, Shun Wang, Guotai Tan, Emilia Morosan, Xia Wang, Hai-Qing Lin, Lei Shu, Gang Chen, Yanfeng Guo, Xingye Lu, Pengcheng Dai
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Publicado: American Physical Society 2021
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spelling oai:doaj.org-article:3375054548ea485397fcc0b88b0869192021-12-02T14:57:59ZSpinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}10.1103/PhysRevX.11.0210442160-3308https://doaj.org/article/3375054548ea485397fcc0b88b0869192021-05-01T00:00:00Zhttp://doi.org/10.1103/PhysRevX.11.021044http://doi.org/10.1103/PhysRevX.11.021044https://doaj.org/toc/2160-3308Triangular lattice of rare-earth ions with interacting effective spin-1/2 local moments is an ideal platform to explore the physics of quantum spin liquids (QSLs) in the presence of strong spin-orbit coupling, crystal electric fields, and geometrical frustration. The Yb delafossites, NaYbCh_{2} (Ch=O, S, Se) with Yb ions forming a perfect triangular lattice, have been suggested to be candidates for QSLs. Previous thermodynamics, nuclear magnetic resonance, and powder-sample neutron scattering measurements on NaYbCh_{2} have supported the suggestion of the QSL ground states. The key signature of a QSL, the spin excitation continuum, arising from the spin quantum number fractionalization, has not been observed. Here we perform both elastic and inelastic neutron scattering measurements as well as detailed thermodynamic measurements on high-quality single-crystal NaYbSe_{2} samples to confirm the absence of long-range magnetic order down to 40 mK, and further reveal a clear signature of magnetic excitation continuum extending from 0.1 to 2.5 meV. The comparison between the structure of the magnetic excitation spectra and the theoretical expectation from the spinon continuum suggests that the ground state of NaYbSe_{2} is a QSL with a spinon Fermi surface.Peng-Ling DaiGaoning ZhangYaofeng XieChunruo DuanYonghao GaoZihao ZhuErxi FengZhen TaoChien-Lung HuangHuibo CaoAndrey PodlesnyakGarrett E. GranrothMichelle S. EverettJoerg C. NeuefeindDavid VoneshenShun WangGuotai TanEmilia MorosanXia WangHai-Qing LinLei ShuGang ChenYanfeng GuoXingye LuPengcheng DaiAmerican Physical SocietyarticlePhysicsQC1-999ENPhysical Review X, Vol 11, Iss 2, p 021044 (2021)
institution DOAJ
collection DOAJ
language EN
topic Physics
QC1-999
spellingShingle Physics
QC1-999
Peng-Ling Dai
Gaoning Zhang
Yaofeng Xie
Chunruo Duan
Yonghao Gao
Zihao Zhu
Erxi Feng
Zhen Tao
Chien-Lung Huang
Huibo Cao
Andrey Podlesnyak
Garrett E. Granroth
Michelle S. Everett
Joerg C. Neuefeind
David Voneshen
Shun Wang
Guotai Tan
Emilia Morosan
Xia Wang
Hai-Qing Lin
Lei Shu
Gang Chen
Yanfeng Guo
Xingye Lu
Pengcheng Dai
Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}
description Triangular lattice of rare-earth ions with interacting effective spin-1/2 local moments is an ideal platform to explore the physics of quantum spin liquids (QSLs) in the presence of strong spin-orbit coupling, crystal electric fields, and geometrical frustration. The Yb delafossites, NaYbCh_{2} (Ch=O, S, Se) with Yb ions forming a perfect triangular lattice, have been suggested to be candidates for QSLs. Previous thermodynamics, nuclear magnetic resonance, and powder-sample neutron scattering measurements on NaYbCh_{2} have supported the suggestion of the QSL ground states. The key signature of a QSL, the spin excitation continuum, arising from the spin quantum number fractionalization, has not been observed. Here we perform both elastic and inelastic neutron scattering measurements as well as detailed thermodynamic measurements on high-quality single-crystal NaYbSe_{2} samples to confirm the absence of long-range magnetic order down to 40 mK, and further reveal a clear signature of magnetic excitation continuum extending from 0.1 to 2.5 meV. The comparison between the structure of the magnetic excitation spectra and the theoretical expectation from the spinon continuum suggests that the ground state of NaYbSe_{2} is a QSL with a spinon Fermi surface.
format article
author Peng-Ling Dai
Gaoning Zhang
Yaofeng Xie
Chunruo Duan
Yonghao Gao
Zihao Zhu
Erxi Feng
Zhen Tao
Chien-Lung Huang
Huibo Cao
Andrey Podlesnyak
Garrett E. Granroth
Michelle S. Everett
Joerg C. Neuefeind
David Voneshen
Shun Wang
Guotai Tan
Emilia Morosan
Xia Wang
Hai-Qing Lin
Lei Shu
Gang Chen
Yanfeng Guo
Xingye Lu
Pengcheng Dai
author_facet Peng-Ling Dai
Gaoning Zhang
Yaofeng Xie
Chunruo Duan
Yonghao Gao
Zihao Zhu
Erxi Feng
Zhen Tao
Chien-Lung Huang
Huibo Cao
Andrey Podlesnyak
Garrett E. Granroth
Michelle S. Everett
Joerg C. Neuefeind
David Voneshen
Shun Wang
Guotai Tan
Emilia Morosan
Xia Wang
Hai-Qing Lin
Lei Shu
Gang Chen
Yanfeng Guo
Xingye Lu
Pengcheng Dai
author_sort Peng-Ling Dai
title Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}
title_short Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}
title_full Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}
title_fullStr Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}
title_full_unstemmed Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe_{2}
title_sort spinon fermi surface spin liquid in a triangular lattice antiferromagnet naybse_{2}
publisher American Physical Society
publishDate 2021
url https://doaj.org/article/3375054548ea485397fcc0b88b086919
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