Incommensurate magnetic order arising from frustrated interchain interactions in the spin-1/2 chain compound AgCuVO₄

2025/07/25 by Hromov, A., Zorko, A., Gomilšek, M. +5
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2507.19207

Abstract

Quantum spin chains with competing interactions offer a platform where low dimensionality and frustration--both acting to suppress magnetic order--intersect. We studied magnetic ordering in the spin-1/2 chain compound AgCuVO₄ using muon spin spectroscopy and neutron diffraction. Long-range magnetic order emerges at T_N = 2.0(1) K, which is ∼1/200 of the dominant intrachain coupling J and ∼1/15 of the interchain interactions. The collinear incommensurate amplitude-modulated magnetic structure features a reduced ordered moment of 0.13(3) μ_B, confined to the ab plane and modulated along the c axis--perpendicular to the spin chains--indicating frustrated interchain couplings. The low T_N, small moment, and incommensurate order highlight strong frustration, positioning AgCuVO₄ as a model system for exploring frustration in quantum spin chains.

Citations

• Recent advances in magnetic structure determination by neutron powder diffraction

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