Richter, Johannes, Zinke, Ronald and Farnell, Damian J. J. ![]() |
Official URL: http://dx.doi.org/10.1140/epjb/e2014-50589-x
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 |
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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: | 04 Jan 2024 08:41 |
URI: | https://orca.cardiff.ac.uk/id/eprint/69112 |
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