Magnetic moments induce strong phonon renormalization in FeSi - Archive ouverte HAL Access content directly
Journal Articles Nature Communications Year : 2015

Magnetic moments induce strong phonon renormalization in FeSi

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Abstract

The interactions of electronic, spin and lattice degrees of freedom in solids result in complex phase diagrams, new emergent phenomena and technical applications. While electron–phonon coupling is well understood, and interactions between spin and electronic excitations are intensely investigated, only little is known about the dynamic interactions between spin and lattice excitations. Noncentrosymmetric FeSi is known to undergo with increasing temperature a crossover from insulating to metallic behaviour with concomitant magnetic fluctuations, and exhibits strongly temperature-dependent phonon energies. Here we show by detailed inelastic neutron-scattering measurements and ab initio calculations that the phonon renormalization in FeSi is linked to its unconventional magnetic properties. Electronic states mediating conventional electron–phonon coupling are only activated in the presence of strong magnetic fluctuations. Furthermore, phonons entailing strongly varying Fe–Fe distances are damped via dynamic coupling to the temperature-induced magnetic moments, highlighting FeSi as a material with direct spin–phonon coupling and multiple interaction paths.

Dates and versions

cea-01820491 , version 1 (21-06-2018)

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S. Krannich, Yvan Sidis, D. Lamago, R. Heid, J.-M. Mignot, et al.. Magnetic moments induce strong phonon renormalization in FeSi. Nature Communications, 2015, 6 (1), ⟨10.1038/ncomms9961⟩. ⟨cea-01820491⟩
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