Li$_2$VO(Si,Ge)O$_4$, a prototype of a two-dimensional frustrated quantum Heisenberg antiferromagnet

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dc.creatorMelzi, R.
dc.creatorCarretta, P.
dc.creatorLascialfari, A.
dc.creatorMambrini, M.
dc.creatorTroyer, M.
dc.creatorMillet, P.
dc.creatorMila, F.
dc.date2000-05-17
dc.date.accessioned2026-07-07T02:37:40Z
dc.date.available2026-07-07T02:37:40Z
dc.descriptionNMR and magnetization measurements in Li$_2$VOSiO$_4$ and Li$_2$VOGeO$_4$ are reported. The analysis of the susceptibility shows that both compounds are two-dimensional $S=1/2$ Heisenberg antiferromagnets on a square lattice with a sizeable frustration induced by the competition between the superexchange couplings $J_1$ along the sides of the square and $J_2$ along the diagonal. Li$_2$VOSiO$_4$ undergoes a low-temperature phase transition to a collinear order, as theoretically predicted for $J_2/J_1 > 0.5$. Just above the magnetic transition the degeneracy between the two collinear ground states is lifted by the onset of a structural distortion.
dc.description4 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0005273
dc.identifierhttp://arxiv.org/abs/cond-mat/0005273
dc.identifierPhys. Rev. Lett. 85, 1318 (2000)
dc.identifierdoi:10.1103/PhysRevLett.85.1318
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/16375
dc.subjectStrongly Correlated Electrons
dc.titleLi$_2$VO(Si,Ge)O$_4$, a prototype of a two-dimensional frustrated quantum Heisenberg antiferromagnet
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