Zone-Boundary-Phonon Raman Scattering in VI2due to Modulation of Exchange Interaction

Abstract
Three new Raman lines appearing below the antiferromagnetic ordering temperature of VI2 are attributed to zone-boundary-phonon Raman scattering induced by the elastic ("Bragg") magnetic scattering from the spin superstructure. The spin-dependent electron-phonon coupling is explained in terms of a modulation of the exchange interactions by selected zone-boundary phonons.

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