Darradi, R., Richter, J. and Farnell, Damian J. J. ![]() |
Abstract
We investigate the phase diagram of the Heisenberg antiferromagnet on the square lattice with two different nearest-neighbour 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 Neel 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 ∝ s(s+1)
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Dentistry |
Subjects: | Q Science > QC Physics |
Publisher: | IOP Publishing |
ISSN: | 0953-8984 |
Last Modified: | 04 Jan 2024 08:40 |
URI: | https://orca.cardiff.ac.uk/id/eprint/64275 |
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