Polarized Neutron Inelastic Scattering Study of the Anisotropic Magnetic Fluctuations in the Quasi-1D Ising-like Antiferromagnet TlCoCl$_3$

TL;DR

This study uses polarized neutron inelastic scattering to investigate anisotropic magnetic fluctuations in TlCoCl₃, revealing longitudinal fluctuations in the spin-wave continuum and comparing results with theoretical predictions.

Contribution

First observation of longitudinal magnetic fluctuations in TlCoCl₃ using polarized neutrons, providing semi-quantitative agreement with perturbation theory.

Findings

Observed longitudinal magnetic fluctuations $S_{zz}(Q, mbda)$ in TlCoCl₃.

Compared experimental data with Ishimura-Shiba perturbation theory.

Found semi-quantitative agreement between experiment and theory.

Abstract

Polarized neutron inelastic scattering experiments have been carried out in the quasi-1D Ising-like antiferromagnet TlCoCl$_3$. We observed the longitudinal magnetic fluctuation $S_{zz} (Q, \omega)$ for the spin-wave excitation continuum, which has not been observed in the unpolarized neutron inelastic scattering experiments of the quasi-1D Ising-like antiferromagnets CsCoCl$_3$ and TlCoCl$_3$ so far, together with the transverse magnetic fluctuation $S_{xx} (Q, \omega)$. We compared both obtained intensities of $S_{xx} (Q, \omega)$ and $S_{zz} (Q, \omega)$ with the perturbation theory from the pure Ising limit by Ishimura and Shiba, and a semi-quantitative agreement was found.