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

Darradi, R., Richter, J. and Farnell, Damian J. J. 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

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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: Dentistry
Subjects: Q Science > QC Physics
Publisher: IOP Publishing
ISSN: 0953-8984
Last Modified: 04 Jun 2017 06:44
URI: http://orca.cf.ac.uk/id/eprint/64275

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