Spin wave approach to the two-magnon Raman scattering in an J1x-J1y-J2-Jc antiferromagnetic Heisenberg model

TL;DR

This paper investigates how magnetic frustration and interlayer coupling influence two-magnon Raman spectra in antiferromagnetic Heisenberg models, providing insights relevant to materials like BaMnBi2 and iron pnictides.

Contribution

It introduces a spin-wave theoretical analysis of two-magnon Raman scattering considering frustration and interlayer effects in specific antiferromagnetic phases.

Findings

Both J2/J1 and Jc significantly affect the spectra.

Splitting of the two-magnon peak observed in the (pi,0) phase.

Implications for understanding Raman spectra in related materials.

Abstract

We study the two-magnon non-resonant Raman scattering in the (pi,pi) and (pi,0) ordered antiferromagnetic phases of a J1x-J1y-J2-Jc Heisenberg model on the tetragonal lattice within the framework of the spin-wave theory. We discuss the effects of various tuning factors to the two-magnon Raman spectra. We find that both the magnetic frustration J2/J1 and the interlayer exchange coupling Jc may significantly affect the spectra in both the B1g and A1g' channels in the (pi,pi) Neel ordered phase. Moreover, we find a splitting of the two-magnon peak in the (pi,0) antiferromagnetic phase. We further discuss the implications of our results to the BaMnBi2 and iron pnictide systems.