Skip to Main content Skip to Navigation
Journal articles

Magnetic moments induce strong phonon renormalization in FeSi

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.
Document type :
Journal articles
Complete list of metadatas

https://hal-cea.archives-ouvertes.fr/cea-01820491
Contributor : Marianne Leriche <>
Submitted on : Thursday, June 21, 2018 - 5:03:56 PM
Last modification on : Monday, February 10, 2020 - 6:12:14 PM

Links full text

Identifiers

Citation

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

Share

Metrics

Record views

128