Three-Spin Interaction in CsMn0.28Mg0.72Br3

Abstract
The inelastic-neutron-scattering technique was used to measure the magnetic excitation spectrum of Mn2+ triads in CsMn0.28 Mg0.72 Br3. It is shown that biquadratic two-spin and particularly three-spin interaction terms distinctly contribute to the spin coupling of the Mn2+ ions. The present work thus provides direct experimental evidence of the existence of three-body forces in an interacting system.

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