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Anomalous spin waves in CsFeCl$ {3}$ and RbFeCl$ {3}$ by Stoppel, L.; Hayashida, S.; Yan, Z.; Podlesnyak, A.; Zheludev, A. is a scholarly article available to read on EtoBox.

What is Anomalous spin waves in CsFeCl$ {3}$ and RbFeCl$ {3}$ about?

We investigate magnetic excitations in the $S=1$ easy-plan-type triangular antiferromagnets CsFeCl$_{3}$ and RbFeCl$_{3}$ through a combination of inelastic neutron scattering measurements and spin-wave theory calculations based on an established exchange-coupling Hamiltonian. We show that in either material the model falls short of providing an adequate description of the measured intensities and for RbFeCl$_{3}$ even fails to reproduce the measured dispersion relation. The most striking discrepancy is a very anisotropic azimuthal intensity distribution in the acoustic spin-wave branches in the long-wavelength limit, which is incompatible with spin-wave theory on a fundamental level. The observed anomalies are attributed to long-range dipolar interactions.

Author

Stoppel, L.; Hayashida, S.; Yan, Z.; Podlesnyak, A.; Zheludev, A.

Published

2021

Language

EN