Darradi, R., Richter, J. and Farnell, Damian J. J.  ORCID: https://orcid.org/0000-0003-0662-1927
2005.
Influence of the spin quantum number s on the zero-temperature phase transition in the square-lattice J-J' model.
Journal of Physics: Condensed Matter
17
(2)
, pp. 341-350.
10.1088/0953-8984/17/2/009
|
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 |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | 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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