Spin Dynamics in a Stripe-ordered Buckled Honeycomb Lattice Antiferromagnet Ba$_{2}$NiTeO$_{6}$

TL;DR

This study investigates the spin dynamics of a stripe-ordered buckled honeycomb antiferromagnet Ba$_{2}$NiTeO$_{6}$ using inelastic neutron scattering and spin-wave calculations, revealing the role of competing interactions and anisotropy in stabilizing its magnetic structure.

Contribution

The paper provides a detailed microscopic model and parameters for Ba$_{2}$NiTeO$_{6}$, linking experimental observations with theoretical calculations to understand its stripe magnetic order.

Findings

Magnetic excitations observed up to 10 meV with a 2 meV anisotropy gap.

Microscopic parameters consistent with the stripe phase in the classical phase diagram.

Competition between NN and NNN interactions stabilizes the stripe magnetic structure.

Abstract

We carried out inelastic neutron scattering experiments on a buckled honeycomb lattice antiferromagnet Ba$_{2}$NiTeO$_{6}$ exhibiting a stripe structure at a low temperature. Magnetic excitations are observed in the energy range of $\hbar \omega \lesssim 10$ meV having an anisotropy gap of 2 meV at 2 K. We perform spin-wave calculations to identify the spin model. The obtained microscopic parameters are consistent with the location of the stripe structure in the classical phase diagram. Furthermore, the Weiss temperature independently estimated from a bulk magnetic susceptibility is consistent with the microscopic parameters. The results reveal that a competition between the NN and NNN interactions that together with a relatively large single ion magnetic anisotropy stabilize the stripe magnetic structure.