Condensed Matter Physics, 2009, vol. 12, No. 3, pp. 497506
DOI:10.5488/CMP.12.3.497
Title:
Properties of the twodimensional spin1/2 Heisenberg model on a honeycomb lattice with interlayer coupling
Author(s):

U. Löw
(Theoretische Physik II, Technische Universität Dortmund, 44227 Dortmund, Germany)

The magnetic properties of the twodimensional S=1/2 (quantum) antiferromagnetic Heisenberg model on a honeycomb lattice with and without interlayer coupling are studied by means of a continuous Euclidean time Quantum MonteCarlo algorithm. The internal energy, the magnetic susceptibility and the staggered magnetization are determined in the full temperature range. For the twodimensional system the groundstate energy/bond is found to be E_{0}^{hc}=0.36303(13), and the zero temperature staggered magnetization m_{st}=0.2681(8). For coupled planes of honeycomb systems a phase transition from an ordered phase to a disordered phase is found at T/J=0.695(10).
Key words:
quantum Heisenberg antiferromagnetic, honeycomb lattice, interlayer coupling
PACS:
71.70.Ch, 61.72.Yx, 64.60.Cn
Comments: Figs. 8, Refs. 30, Tabs. 0
