Influence of the spin quantum number $s$ on the zero-temperature phase transition in the square lattice $J$-$J'$ model

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dc.creatorDarradi, R.
dc.creatorRichter, J.
dc.creatorFarnell, D. J. J.
dc.date2004-10-15
dc.date.accessioned2026-07-07T03:01:30Z
dc.date.available2026-07-07T03:01:30Z
dc.descriptionWe investigate the phase diagram of the Heisenberg antiferromagnet on the square lattice with two different nearest-neighbor bonds $J$ and $J'$ ($J$-$J'$ model) at zero temperature. The model exhibits a quantum phase transition at a critical value $J'_c > J$ between a semi-classically ordered Néel and a magnetically disordered quantum paramagnetic phase of valence-bond type, which is driven by local singlet formation on $J'$ bonds. We study the influence of spin quantum number $s$ on this phase transition by means of a variational mean-field approach, the coupled cluster method, and the Lanczos exact-diagonalization technique. We present evidence that the critical value $J'_c$ increases with growing $s$ according to $J'_c \propto s(s+1)$.
dc.description13 pages, 6 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0410397
dc.identifierhttp://arxiv.org/abs/cond-mat/0410397
dc.identifierJ.Phys.: Condens. Matter 17 (2005) 341-350
dc.identifierdoi:10.1088/0953-8984/17/2/009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25074
dc.subjectStrongly Correlated Electrons
dc.titleInfluence of the spin quantum number $s$ on the zero-temperature phase transition in the square lattice $J$-$J'$ model
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