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The spin-1/2 square-lattice J1-J2 model: the spin-gap

Richter, Johannes, Zinke, Ronald and Farnell, Damian J. J. 2015. The spin-1/2 square-lattice J1-J2 model: the spin-gap. European Physical Journal B Condensed Matter Physics 88 (2) , pp. 1-6. 10.1140/epjb/e2014-50589-x

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Abstract

We use the coupled cluster method to high orders of approximation in order to calculate the ground-state energy, the ground-state magnetic order parameter, and the spin gap of the spin-1/2 J 1-J 2 model on the square lattice. We obtain values for the transition points to the magnetically disordered quantum paramagnetic phase of J 2 c1 = 0.454J 1 and J 2 c2 = 0.588J 1. The spin gap is zero in the entire parameter region accessible by our approach, i.e. for J 2 ≤ 0.49J 1 and J 2> 0.58J 1. This finding is in favor of a gapless spin-liquid ground-state in this parameter regime.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Subjects: Q Science > QC Physics
Uncontrolled Keywords: Solid State and Materials.
Publisher: Springer Verlag
ISSN: 1434-6028
Last Modified: 12 Mar 2019 10:37
URI: http://orca.cf.ac.uk/id/eprint/69112

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