Effect of local charge fluctuations on spin physics in the Neel state of La$_2$CuO$_4$

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dc.creatorCapriotti, Luca
dc.creatorLaeuchli, Andreas
dc.creatorParamekanti, Arun
dc.date2005-06-07
dc.date2005-09-12
dc.date.accessioned2026-07-07T06:24:51Z
dc.date.available2026-07-07T06:24:51Z
dc.descriptionWe explore the effect of local charge fluctuations on the spin response of a Mott insulator by deriving an effective spin model, and studying it using Schwinger boson mean field theory. Applying this to La$_2$CuO$_4$, we show that an accurate fit to the magnon dispersion relation, measured by Coldea {\em et al.} [Phys. Rev. Lett. {\bf 86}, 5377 (2001)] is obtained with Hubbard model parameters $U \approx 2.34 eV$, and $t \approx 360 meV$. These parameters lead to estimates of the staggered magnetization ($m_s \approx 0.25$), spin wave velocity ($c\approx 800 meV$-Å), and spin stiffness ($ρ_s \approx 24 meV$). In particular the staggered moment as well as the effective local moment are renormalized to smaller values compared to the Heisenberg model due to local charge fluctuations in the Hubbard model. The dynamical structure factor shows considerable weight in the continuum along the zone boundary as well as secondary peaks that may be observed in high resolution neutron scattering experiments.
dc.descriptionManuscript considerably revised following referee comments. Also added a brief discussion of sum rules. 8 pages, 6 eps figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0506188
dc.identifierhttp://arxiv.org/abs/cond-mat/0506188
dc.identifierPhys. Rev. B 72, 214433 (2005)
dc.identifierdoi:10.1103/PhysRevB.72.214433
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/96688
dc.subjectStrongly Correlated Electrons
dc.titleEffect of local charge fluctuations on spin physics in the Neel state of La$_2$CuO$_4$
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