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

TL;DR

This paper investigates the magnetic properties of antiferromagnetic quantum Heisenberg spin systems with a strict single particle site occupation constraint, incorporating quantum fluctuations and comparing different theoretical approaches.

Contribution

It provides a detailed analysis of magnetization and susceptibility in constrained spin-1/2 systems, including quantum fluctuation effects beyond mean field theory.

Findings

Quantum fluctuations significantly affect magnetization and susceptibility.

Results are valid near the critical point and align with spin wave approach.

The study offers insights into the effects of strict site occupation constraints.

Abstract

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.