Magnetic phase diagram of spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice

TL;DR

This paper explores the magnetic phase diagram of a frustrated, anisotropic spin-1/2 Heisenberg antiferromagnet on a stacked square lattice, highlighting the importance of second-order corrections in understanding magnetic phases.

Contribution

It provides a detailed analysis of how interlayer coupling and spatial anisotropy influence magnetic ordering using second-order spin-wave expansion, revealing significant differences from linear theory.

Findings

Discovered two magnetic phases: Neel and stripe.

Found a paramagnetic disordered phase separating these states.

Second-order corrections stabilize magnetization and affect phase boundaries.

Abstract

Magnetic phase diagram of a spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice is investigated using second-order spin-wave expansion. The effects of interlayer coupling and the spatial anisotropy on the magnetic ordering of two ordered ground states are explicitly studied. It is shown that with increase in next nearest neighbor frustration the second-order corrections play a significant role in stabilizing the magnetization. We obtain two ordered magnetic phases (Neel and stripe) separated by a paramagnetic disordered phase. Within second-order spin-wave expansion we find that the width of the disordered phase diminishes with increase in the interlayer coupling or with decrease in spatial anisotropy but it does not disappear. Our obtained phase diagram differs significantly from the phase diagram obtained using linear spin-wave theory.