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Issue 11, 2025
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90th anniversary of the P.L. Kapitza Institute for Physical Problems RAS. Conferences and symposia


Fermi liquid of spinons in quasi-one-dimensional antiferromagnets

† 
P.L. Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 119334, Russian Federation

We report the experimental observation of a shift of the boundaries of the spinon continuum caused by a Fermi-liquid interaction of spinons in the spin-liquid S=1/2 chain-type antiferromagnet K2CuSO4Br2. The parameter of spinon interaction, which determines the probability of backscattering, is found. In the pseudospin S=1/2 chain-type strongly anisotropic antiferromagnet Cs2CoCl4, a shift in the magnetic resonance frequency is detected during the crossover from the disordered spin regime to the state of correlated XXZ-type spin chains at a temperature above the emergence of long-range antiferromagnetic order. This resonance shift is explained on the basis of the spectrum of spin excitations in correlated XXZ chains and corresponds to theoretical simulation of the spectra of spinon-type magnetic fluctuations in XXZ chains [P. Laurell et al. Phys. Rev. Lett.127 037201 (2021)].

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Fulltext is also available at DOI: 10.3367/UFNe.2024.12.039842
Keywords: spin chains, spinons, spin liquids, magnetic resonance, antiferromagnets, quantum magnets
PACS: 75.10.Jm, 75.10.Pq, 75.40.Gb (all)
DOI: 10.3367/UFNe.2024.12.039842
URL: https://ufn.ru/en/articles/2025/7/j/
2-s2.0-105013768298
2025PhyU...68..728S
Citation: Smirnov A I "Fermi liquid of spinons in quasi-one-dimensional antiferromagnets" Phys. Usp. 68 728–735 (2025)
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Received: 18th, December 2024, 18th, December 2024

Оригинал: Смирнов А И «Ферми-жидкость спинонов в квазиодномерных антиферромагнетиках» УФН 195 778–786 (2025); DOI: 10.3367/UFNr.2024.12.039842

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