The sublattice magnetizations of the spin-s quantum Heisenberg antiferromagnets

TL;DR

This paper develops a magnon theory for spin-s quantum Heisenberg antiferromagnets that eliminates unphysical magnon states, enabling accurate predictions of Neel temperature and sublattice magnetization for all temperatures below T_N.

Contribution

It introduces a magnon theory free of unphysical states, providing reliable calculations of Neel temperature and sublattice magnetization for spin-s models.

Findings

Derived a consistent Neel temperature T_N for spin-s models.

Achieved reasonable sublattice magnetization predictions below T_N.

Provided a unified approach applicable for all T ≤ T_N.

Abstract

We study the spin-$s$ quantum Heisenberg antiferromagnetic models in a magnon theory free of any unphysical magnon state. Because the unphysical magnon states are completely removed in the magnon Hamiltonians and during the approximation process, we derive spin-s (s>1/2) reliable Neel temperature $T_N$ and reasonable sublattice magnetization unified for $T\leq T_N$.