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Magnetic moments induce strong phonon renormalization in FeSi

Author

Listed:
  • S. Krannich

    (Institute for Solid State Physics, Karlsruhe Institute of Technology)

  • Y. Sidis

    (Laboratoire Léon Brillouin (CEA-CNRS), CEA Saclay)

  • D. Lamago

    (Institute for Solid State Physics, Karlsruhe Institute of Technology
    Laboratoire Léon Brillouin (CEA-CNRS), CEA Saclay)

  • R. Heid

    (Institute for Solid State Physics, Karlsruhe Institute of Technology)

  • J.-M. Mignot

    (Laboratoire Léon Brillouin (CEA-CNRS), CEA Saclay)

  • H. v. Löhneysen

    (Institute for Solid State Physics, Karlsruhe Institute of Technology
    Physics Institute, Karlsruhe Institute of Technology)

  • A. Ivanov

    (Institute Laue-Langevin)

  • P. Steffens

    (Institute Laue-Langevin)

  • T. Keller

    (Max Planck Institute for Solid State Research
    Max Planck Society, Outstation at the FRM II)

  • L. Wang

    (Institute for Solid State Physics, Karlsruhe Institute of Technology)

  • E. Goering

    (Max Planck Institute for Intelligent Systems)

  • F. Weber

    (Institute for Solid State Physics, Karlsruhe Institute of Technology)

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.

Suggested Citation

  • S. Krannich & Y. Sidis & D. Lamago & R. Heid & J.-M. Mignot & H. v. Löhneysen & A. Ivanov & P. Steffens & T. Keller & L. Wang & E. Goering & F. Weber, 2015. "Magnetic moments induce strong phonon renormalization in FeSi," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9961
    DOI: 10.1038/ncomms9961
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    Cited by:

    1. Philipp Kurzhals & Geoffroy Kremer & Thomas Jaouen & Christopher W. Nicholson & Rolf Heid & Peter Nagel & John-Paul Castellan & Alexandre Ivanov & Matthias Muntwiler & Maxime Rumo & Bjoern Salzmann & , 2022. "Electron-momentum dependence of electron-phonon coupling underlies dramatic phonon renormalization in YNi2B2C," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    2. H. Miao & T. T. Zhang & H. X. Li & G. Fabbris & A. H. Said & R. Tartaglia & T. Yilmaz & E. Vescovo & J.-X. Yin & S. Murakami & X. L. Feng & K. Jiang & X. L. Wu & A. F. Wang & S. Okamoto & Y. L. Wang &, 2023. "Signature of spin-phonon coupling driven charge density wave in a kagome magnet," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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