Spin Excitation in Coupled Honeycomb Lattice Ni$_2$InSbO$_6$

TL;DR

This study investigates the spin excitations in Ni$_2$InSbO$_6$, revealing well-defined spin waves and proposing a spin model that explains the observed phenomena and the magnetic field-induced soliton lattice.

Contribution

The paper provides the first detailed spin-wave spectrum analysis of Ni$_2$InSbO$_6$ and introduces a spin Hamiltonian model that accounts for the magnetic excitations and soliton lattice formation.

Findings

Observation of 20 meV spin-wave excitation below 76 K

Reproduction of the spectrum with a honeycomb spin layer model

Explanation of the soliton lattice induced by magnetic field

Abstract

We performed an inelastic neutron scattering experiment on a polycrystalline sample of a helimagnet Ni$_2$InSbO$_6$ to construct the spin Hamiltonian. Well-defined spin-wave excitation with a band energy of 20 meV was observed below $T_{N} = 76$ K. Using the linear spin-wave theory, the spectrum was reasonably reproduced with honeycomb spin layers coupled along the stacking axis (the $c$ axis). The proposed spin model reproduces the soliton lattice induced by a magnetic field applied perpendicular to the $c$ axis.