Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe2

Xie, Tao; Eberharter, A. A.; Xing, Jie; Nishimoto, Satoshi; Brando, M.; Khanenko, P.; Sichelschmidt, J.; Turrini, A. A.; Mazzone, D. G.; Naumov, P. G.; Sanjeewa, Liurukara D.; Harrison, N.; Sefat, Athena S.; Normand, B.; Läuchli, A. M.; Podlesnyak, Andrey A.; Nikitin, Stanislav E.

doi:10.1038/s41535-023-00580-9

Title: Complete field-induced spectral response of the spin-1/2 triangular-lattice antiferromagnet CsYbSe₂

Journal Article · Sat Sep 23 00:00:00 EDT 2023 · npj Quantum Materials

DOI:https://doi.org/10.1038/s41535-023-00580-9· OSTI ID:2006954

^[1];

^[2];

^[1]; Nishimoto, Satoshi ^[3]; Brando, M. ^[4]; Khanenko, P. ^[4];

^[4]; Turrini, A. A. ^[5];

^[5]; Naumov, P. G. ^[6]; Sanjeewa, Liurukara D. ^[1];

^[7];

^[1]; Normand, B. ^[5]; Läuchli, A. M. ^[5];

^[1]; Nikitin, Stanislav E. ^[5]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Univ. Innsbruck (Austria)
Technische Universität Dresden (Germany); Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany)
Paul Scherrer Inst. (PSI), Villigen (Switzerland)
Paul Scherrer Inst. (PSI), Villigen (Switzerland); Orange Quantum Systems (Netherlands)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Fifty years after Anderson’s resonating valence-bond proposal, the spin-1/2 triangular-lattice Heisenberg antiferromagnet (TLHAF) remains the ultimate platform to explore highly entangled quantum spin states in proximity to magnetic order. Yb-based delafossites are ideal candidate TLHAF materials, which allow experimental access to the full range of applied in-plane magnetic fields. We perform a systematic neutron scattering study of CsYbSe₂, first proving the Heisenberg character of the interactions and quantifying the second-neighbor coupling. We then measure the complex evolution of the excitation spectrum, finding extensive continuum features near the 120°-ordered state, throughout the 1/3-magnetization plateau and beyond this up to saturation. We perform cylinder matrix-product-state (MPS) calculations to obtain an unbiased numerical benchmark for the TLHAF and spectacular agreement with the experimental spectra. The measured and calculated longitudinal spectral functions reflect the role of multi-magnon bound and scattering states. These results provide valuable insight into unconventional field-induced spin excitations in frustrated quantum materials.

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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:: AC05-00OR22725

OSTI ID:: 2006954

Journal Information:: npj Quantum Materials, Vol. 8, Issue 1; ISSN 2397-4648

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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