2008
DOI: 10.1088/0953-8984/20/25/255251
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The quantumJ1J1′–J2spin-1/2 Heisenberg model: influence of the interchain coupling on the ground-state magnetic ordering in two dimensions

Abstract: We study the phase diagram of the two-dimensional (2D) J 1-J 1-J 2 spin-1/2 Heisenberg model by means of the coupled cluster method. The effect of the coupling J 1 on the Néel and stripe states is investigated. We find that the quantum critical points for the Néel and stripe phases increase as the coupling strength J 1 is increased, and an intermediate phase emerges above the region at J 1 ≈ 0.6 when J 1 = 1. We find indications for a quantum triple point at J 1 ≈ 0.60 ± 0.03, J 2 ≈ 0.33 ± 0.02 for J 1 = 1.

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Cited by 78 publications
(193 citation statements)
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“…[11][12][13]61,62 We have also performed extrapolations for the data set with m = {6, 8, 10}. Both sets of results agree well with one another, which gives added credence to our results.…”
Section: Coupled Cluster Methodssupporting
confidence: 75%
See 2 more Smart Citations
“…[11][12][13]61,62 We have also performed extrapolations for the data set with m = {6, 8, 10}. Both sets of results agree well with one another, which gives added credence to our results.…”
Section: Coupled Cluster Methodssupporting
confidence: 75%
“…It has been used to study various quantum magnets (see, e.g., Refs. [11][12][13][14][61][62][63][64][65][66][67][68][69][70][71] and references cited therein) very successfully. The method is particularly suitable for investigating frustrated systems, due to the fact that some of the main alternative methods are restricted by certain problems that arise in such cases.…”
Section: Coupled Cluster Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…In order to illustrate the nature of the phase transition, we also show, in inset The obtained phase diagram can be compared with recent results which used effective-field theory 34 and coupled-cluster method 30 , showing the same qualitative results predicting a paramagnetic region for small interlayer parameter (i.e., λ > λ 1 ), and for λ < λ 1 this QP phase disappears by presenting a direct first-order transition between the AF and CAF phases. On the other hand, recent calculations of second order spin wave theory 33 have…”
Section: Resultsmentioning
confidence: 94%
“…A generalization of the J 1 − J 2 Heisenberg antiferromagnetic model on a square lattice was introduced by Nersesyan and Tsvelik 26 and studied by other groups [27][28][29][30][31][32][33][34] , the so-called destroys it completely at a certain value of the interchain parameter λ.…”
mentioning
confidence: 99%