Anomalous spin waves in and

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

doi:10.1103/PhysRevB.104.094422

Anomalous spin waves in and

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

Direct Geometry

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2 Scopus citations

Abstract

We investigate magnetic excitations in the easy-plane-type triangular antiferromagnets and 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 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.

Original language	English
Article number	094422
Journal	Physical Review B
Volume	104
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.104.094422
State	Published - Sep 1 2021

Funding

We thank Dr. K. Yu. Povarov and Dr. V. K. Bhartiya for helpful comments on the spin-wave analysis. This work was supported by Swiss National Science Foundation under Division II. The neutron scattering experiment at the CNCS used resources at the Spallation Neutron Source, a Department of Energy Office of Science User Facility operated by the Oak Ridge National Laboratory (IPTS-21713.1).

Funders	Funder number
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

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10.1103/PhysRevB.104.094422

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Anomalous spin waves in and

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