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arXiv · 2610.24263

Charge disproportionation and spin ordering in LiV$_2$O$_5$ and NaV$_2$O$_5$: a distributed moment point of view

Claudio Garcia·Ilteris K. Turan·Jerome Jackson·Swagata Acharya·Mark van Schilfgaarde·Walter R. L. Lambrecht
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Abstract

The effects of charge disproportionation between V$^{4+}$ and V$^{5+}$ on the exchange interactions and related magnetic, electronic and optical properties are studied in LiV$_2$O$_5$ and NaV$_2$O$_5$. The magnetic exchange interactions between local moments on atomic sites are calculated using a linear response approach based on the QS$GW$ band structure. While the induced magnetic moments are small on the vanadyl O$_v$ and bridge O$_b$, their exchange interactions with the V are found to be larger than between V atoms. The Néel temperature $T_N$ are calculated within the mean-field (MFA) and random phase (RPA) approximations for two different crystal structures with $P2_1mn$ and $Pmmn$ spacegroups. The critical temperatures are are corrected by a quantum statistical factor of (S+1)/S to obtain reasonable agreement with experiment. Band structures, optical dielectric functions calculated using the Bethe Salpeter Equation method and spin waves are also calculated and presented for both crystal structures and both compounds. The spin wave dispersions are calculated from the classical Heisenberg Hamiltonian including magnetic moments on both V and O atoms. Besides the lowest energy weakly interacting spin waves of the two chains of spins in the unit cell, the model predicts additional high energy optical spin waves, which correspond to more complex spin excitations in which the spins on the two V across a bridge, vanadyl O and bridge O precess independently from each other instead of staying locked together according to their collinear alignment in the ground state. These show only weak dispersion and extend up to about 1 eV but we argue that these are an artefact of using the Heisenberg model beyond its validity range and would be suppressed in a more complete theory that allows for coupling of the transverse spin with longitudinal spin and charge excitations.

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Claudio Garcia, Ilteris K. Turan, Jerome Jackson, Swagata Acharya, Mark van Schilfgaarde, Walter R. L. Lambrecht. 2026-10-16. Charge disproportionation and spin ordering in LiV$_2$O$_5$ and NaV$_2$O$_5$: a distributed moment point of view. https://arxiv.org/abs/2610.24263

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