Advanced Condensed Matter Physics
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Abstract
Abstract
The S = 1/2 Heisenberg antiferromagnetic chain is a paradigmatic quantum system hosting exotic excitations. Using nuclear magnetic resonance (NMR) on copper benzoate, we characterise three distinct types of excitations by tuning the magnetic field at ultra-low temperatures. At 0.2 T, a nearly constant spin-lattice relaxation rate (1/T1) and a divergence-like spin-spin relaxation rate (1/T2G) upon cooling provide experimental evidence for spinon excitations. Below 0.4 K, an additional relaxation channel, characterised by 1/T1 ∝ T with spectral weight growing as $$-\ln (T/{T}_{0})$$ and a divergence of the NMR Knight shift (Kn), reveals random-singlet-like behaviours. Above 1 T, a field-induced spin gap Δ ∝ H2/3 signifies the onset of soliton excitations. This work offers NMR identification of spinons, solitons, and the low-energy behaviours of a random-singlet-like state in copper benzoate, and establishes this material as a unique platform for studying the interplay of quantum integrability and disorder. A detailed low-temperature NMR study on copper benzoate reveals spinon excitations, low-temperature random-singlet-like behaviours and field-induced solitons, highlighting the interplay between crystal structure and weak disorder in a spin-chain system.
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@article{Chen2026Spinons,
title = {Spinons, solitons and random-singlet-like behaviours in the spin-chain compound copper benzoate},
author = {Ying Chen and Guijing Duan and Yuejiu Zhao and Ning Xi and Bingying Pan and Xiaoyu Xu and Zhanlong Wu and Kefan Du and Shuo Li and Shuo Li and Ze Hu and Xinyu Shi and Rui Bian and Xiaoqun Wang and Wei Li and Yi Cui and Long Zhang and Shiyan Li and Rong Yu and Weiqiang Yu},
journal = {Nature Communications},
year = {2026},
doi = {10.1038/s41467-026-77134-7},
url = {https://doi.org/10.1038/s41467-026-77134-7}
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