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Article: Spinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe2

TitleSpinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe2
Authors
Issue Date2021
PublisherAmerican Physical Society: Open Access. The Journal's web site is located at http://journals.aps.org/prx/
Citation
Physical Review X, 2021, v. 11 n. 2, p. article no. 021044 How to Cite?
AbstractTriangular 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, NaYbCh2 (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 NaYbCh2 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 NaYbSe2 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 NaYbSe2 is a QSL with a spinon Fermi surface. © 2021 authors. Published by the American Physical Society.
Persistent Identifierhttp://hdl.handle.net/10722/300325
ISSN
2020 Impact Factor: 15.762
2015 SCImago Journal Rankings: 5.040

 

DC FieldValueLanguage
dc.contributor.authorDai, PL-
dc.contributor.authorZhang, G-
dc.contributor.authorXie, Y-
dc.contributor.authorDuan, C-
dc.contributor.authorGao, Y-
dc.contributor.authorZhu, Z-
dc.contributor.authorFeng, E-
dc.contributor.authorTao, Z-
dc.contributor.authorHuang, CL-
dc.contributor.authorCao, H-
dc.contributor.authorPodlesnyak, A-
dc.contributor.authorGranroth, GE-
dc.contributor.authorEverett, MS-
dc.contributor.authorNeuefeind, JC-
dc.contributor.authorVoneshen, D-
dc.contributor.authorWang, S-
dc.contributor.authorTan, G-
dc.contributor.authorMorosan, E-
dc.contributor.authorWang, X-
dc.contributor.authorLin, HQ-
dc.contributor.authorShu, L-
dc.contributor.authorChen, G-
dc.contributor.authorGuo, Y-
dc.contributor.authorLu, X-
dc.contributor.authorDai, P-
dc.date.accessioned2021-06-04T08:41:20Z-
dc.date.available2021-06-04T08:41:20Z-
dc.date.issued2021-
dc.identifier.citationPhysical Review X, 2021, v. 11 n. 2, p. article no. 021044-
dc.identifier.issn2160-3308-
dc.identifier.urihttp://hdl.handle.net/10722/300325-
dc.description.abstractTriangular 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, NaYbCh2 (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 NaYbCh2 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 NaYbSe2 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 NaYbSe2 is a QSL with a spinon Fermi surface. © 2021 authors. Published by the American Physical Society.-
dc.languageeng-
dc.publisherAmerican Physical Society: Open Access. The Journal's web site is located at http://journals.aps.org/prx/-
dc.relation.ispartofPhysical Review X-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleSpinon Fermi Surface Spin Liquid in a Triangular Lattice Antiferromagnet NaYbSe2-
dc.typeArticle-
dc.identifier.emailChen, G: gangchen@hku.hk-
dc.identifier.authorityChen, G=rp02491-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1103/PhysRevX.11.021044-
dc.identifier.scopuseid_2-s2.0-85107961913-
dc.identifier.hkuros322710-
dc.identifier.volume11-
dc.identifier.issue2-
dc.identifier.spagearticle no. 021044-
dc.identifier.epagearticle no. 021044-
dc.publisher.placeUnited States-

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