Proximate spin liquid and fractionalization in the triangular antiferromagnet KYbSe2

Scheie, A. O.; Ghioldi, E. A.; Xing, J.; Paddison, J. A. M.; Sherman, N. E.; Dupont, M.; Sanjeewa, L. D.; Lee, Sangyun; Woods, A. J.; Abernathy, D.; Pajerowski, D. M.; Williams, T. J.; Zhang, Shang-Shun; Manuel, L. O.; Trumper, A. E.; Pemmaraju, C. D.; Sefat, A. S.; Parker, D. S.; Devereaux, T. P.; Movshovich, R.; Moore, J. E.; Batista, C. D.; Tennant, D. A.

doi:10.1038/s41567-023-02259-1

Proximate spin liquid and fractionalization in the triangular antiferromagnet KYbSe₂

Journal Article · Mon Nov 06 00:00:00 EST 2023 · Nature Physics

DOI:https://doi.org/10.1038/s41567-023-02259-1· OSTI ID:2281652

^[1]; Ghioldi, E. A. ^[2]; Xing, J. ^[3]; ^[3]; Sherman, N. E. ^[4]; ^[4]; Sanjeewa, L. D. ^[5]; Lee, Sangyun ^[6]; Woods, A. J. ^[6]; ^[3]; ^[3]; ^[3]; Zhang, Shang-Shun ^[7]; Manuel, L. O. ^[8]; ^[8]; ^[9]; Sefat, A. S. ^[3]; Parker, D. S. ^[3]; ^[10]; ^[6] more »

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); University of Tennessee
Univ. of Tennessee, Knoxville, TN (United States); National Univ. of Rosario (Argentina)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. of California, Berkeley, CA (United States)
Univ. of Missouri, Columbia, MO (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Minnesota, Minneapolis, MN (United States)
National Univ. of Rosario (Argentina)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES)
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Shull Wollan Center

The Heisenberg triangular-lattice quantum spin liquid and its phase transitions to nearby magnetic orders have received much theoretical attention, but clear experimental manifestations of these states are rare. Here we demonstrate that a spin-half delafossite material, namely, KYbSe₂, shows close proximity to the triangular-lattice Heisenberg quantum spin liquid. Using neutron scattering, we identify a diffuse continuum with a sharp lower bound within the measured spectra. Applying entanglement witnesses to the data indicates multipartite entanglement spread between its neighbours, and an analysis of its magnetic-exchange couplings reveals close proximity to the theoretical quantum spin-liquid phase. The key features of the data are reproduced by Schwinger boson theory and tensor network calculations with a substantial next-nearest-neighbour coupling. The strength of the dynamical structure factor at the Brillouin-zone K point shows a scaling collapse down to 0.3 K, indicating the existence of a second-order quantum phase transition. Finally, comparing this with previous theoretical work suggests that the proximate phase at a larger next-nearest-neighbour coupling is a gapped $$\mathbb{Z}_{2}$$ spin liquid, resolving a long-debated issue. Similar content being viewed by others

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; AC05-00OR22725

OSTI ID:: 2281652

Journal Information:: Nature Physics, Journal Name: Nature Physics Journal Issue: 1 Vol. 20; ISSN 1745-2473

Publisher:: Nature Publishing Group (NPG)Copyright Statement

Country of Publication:: United States

Language:: English

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Proximate spin liquid and fractionalization in the triangular antiferromagnet KYbSe2

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