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We investigated the magnetoelastic properties of the quasi-one-dimensionalspin-1/2 frustrated magnet LiCuVO$_4$. Longitudinal-magnetostrictionexperiments were performed at 1.5 K in high magnetic fields of up to 60 Tapplied along the $b$ axis, i.e., the spin-chain direction. Themagnetostriction data qualitatively resemble the magnetization results, andsaturate at $H_{\text{sat}} \approx 54$ T, with a relative change in samplelength of $\Delta L/L \approx 1.8\times10^{-4}$. Remarkably, both themagnetostriction and the magnetization evolve gradually between $H_{\text{c3}}\approx 48$ T and $H_{\text{sat}}$, indicating that the two quantitiesconsistently detect the spin-nematic phase just below the saturation. Numericalanalyses for a weakly coupled spin-chain model reveal that the observedmagnetostriction can overall be understood within an exchange-strictionmechanism. Small deviations found may indicate nontrivial changes in localcorrelations associated with the field-induced phase transitions.

Magnetoelastic study on the frustrated quasi-one-dimensional spin-1/2 magnet LiCuVO$_4$