Magnetic properties of antiferromagnetic quantum Heisenberg spin systems with a strict single particle site occupation

Details Magnetic properties of antiferromagnetic quantum Heisenberg spin systems with a strict single particle site occupation Magnetic properties of antiferromagnetic quantum Heisenberg spin systems with a strict single particle site occupation

2005-10-31

arxiv.org/abs/cond-mat/0510832v1

Eur.Phys.J. B 49, 187-194 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 4 figures

Scientific paper

10.1140/epjb/e2006-00052-x

We work out the magnetization and susceptibility of Heisenberg- and XXZ-model antiferromagnet spin-1/2 systems in $D$ dimensions under a rigorous constraint of single particle site occupancy. Quantum fluctuations are taken into account up to the first order in a loop expansion beyond the N\'eel state mean field solution. We discuss the results, their validity in the vicinity of the critical point and compare them with the results obtained by means of a spin wave approach.

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