Coupled Cluster Treatment of the Shastry-Sutherland Antiferromagnet

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dc.creatorDarradi, R.
dc.creatorRichter, J.
dc.creatorFarnell, D. J. J.
dc.date2005-04-12
dc.date2005-09-20
dc.date.accessioned2026-07-07T06:18:16Z
dc.date.available2026-07-07T06:18:16Z
dc.descriptionWe consider the zero-temperature properties of the spin-half two-dimensional Shastry-Sutherland antiferromagnet by using a high-order coupled cluster method (CCM) treatment. We find that this model demonstrates various groundstate phases (Néel, magnetically disordered, orthogonal dimer), and we make predictions for the positions of the phase transition points. In particular, we find that orthogonal-dimer state becomes the groundstate at ${J}^{d}_2/J_1 \sim 1.477$. For the critical point $J_2^{c}/J_1$ where the semi-classical Néel order disappears we obtain a significantly lower value than $J_2^{d}/J_1$, namely, ${J}^{c}_2/J_1$ in the range $[1.14, 1.39]$. We therefore conclude that an intermediate phase exists between the \Neel and the dimer phases. An analysis of the energy of a competing spiral phase yields clear evidence that the spiral phase does not become the groundstate for any value of $J_2$. The intermediate phase is therefore magnetically disordered but may exhibit plaquette or columnar dimer ordering.
dc.description6 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0504283
dc.identifierhttp://arxiv.org/abs/cond-mat/0504283
dc.identifierPhys.Rev.B {\bf 72}, 104425 (2005)
dc.identifierdoi:10.1103/PhysRevB.72.104425
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/94681
dc.subjectStrongly Correlated Electrons
dc.subjectStatistical Mechanics
dc.titleCoupled Cluster Treatment of the Shastry-Sutherland Antiferromagnet
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