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- W2024624919 abstract "We have performed nuclear magnetic resonance (NMR) experiments on the quasi-one-dimensional frustrated spin-1/2 system ${mathrm{LiCuVO}}_{4}$ in magnetic fields $H$ applied along the $c$ axis up to field values near the saturation field ${H}_{mathrm{sat}}$. For the field range ${H}_{mathrm{c}2}<H<{H}_{mathrm{c}3}$ $({ensuremath{mu}}_{0}{H}_{mathrm{c}2}phantom{rule{0.16em}{0ex}}ensuremath{approx}phantom{rule{0.16em}{0ex}}7.5$ T and ${ensuremath{mu}}_{0}{H}_{mathrm{c}3}=[40.5ifmmodepmelsetextpmfi{}0.2]text{T})$, the $^{51}mathrm{V}$ NMR spectra at $T=380$ mK exhibit a characteristic double-horn pattern, as expected for a spin-modulated phase in which the magnetic moments of ${mathrm{Cu}}^{2+}$ ions are aligned parallel to the applied field $H$ and their magnitudes change sinusoidally along the magnetic chains. For higher fields, the $^{51}mathrm{V}$ NMR spectral shape changes from the double-horn pattern into a single Lorentzian line. For this Lorentzian line, the internal field at the $^{51}mathrm{V}$ nuclei stays constant for ${ensuremath{mu}}_{0}H>41.4$ T, indicating that the majority of magnetic moments in ${mathrm{LiCuVO}}_{4}$ are already saturated in this field range. This result is inconsistent with the previously observed linear field dependence of the magnetization $M(H)$ for ${H}_{mathrm{c}3}<H<{H}_{mathrm{sat}}$ with ${ensuremath{mu}}_{0}{H}_{mathrm{sat}}=45$ T [L. E. Svistov et al., JETP Lett. 93, 21 (2011)]. We argue that the discrepancy is due to nonmagnetic defects in the samples. The results of the spin-lattice relaxation rate of $^{7}mathrm{Li}$ nuclei indicate an energy gap which grows with field twice as fast as the Zeeman energy of a single spin, therefore suggesting that the two-magnon bound state is the lowest-energy excitation. The energy gap tends to close at ${ensuremath{mu}}_{0}Hensuremath{approx}41$ T. Our results suggest that the theoretically predicted spin-nematic phase, if it exists in ${mathrm{LiCuVO}}_{4}$, can be established only within the narrow field range $40.5<{ensuremath{mu}}_{0}H<41.4$ T." @default.
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- W2024624919 date "2014-10-03" @default.
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- W2024624919 title "Search for a spin-nematic phase in the quasi-one-dimensional frustrated magnet<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mi mathvariant=normal>LiCuVO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>" @default.
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- W2024624919 doi "https://doi.org/10.1103/physrevb.90.134401" @default.
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