Electron-phonon coupling in Mn1−xFexSi

Nazir Khan, O. De la Peña-Seaman, Rolf Heid, David Voneshen, Ayman H. Said, Andreas Bauer, Tobias Konrad, Michael Merz, Thomas Wolf, C. Pfleiderer, and Frank Weber
Phys. Rev. B 109, 184306 – Published 7 May 2024
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Abstract

We present a study of the lattice dynamical properties of Mn1−xFexSi with 0≤x≤0.22. Employing time-of-flight neutron spectroscopy and inelastic x-ray scattering, we investigate the doping dependence of phonon energies, Eph, and linewidths, Γph. We find anomalous softening and broadening of a phonon mode propagating along the [111] direction. Ab initio lattice dynamical calculations link this softening to an enhanced electron-phonon coupling due to the doping-dependent changes of the Fermi surface. We discuss an interplay of increased electron-phonon coupling and reduced ordered magnetic moments in Mn1−xFexSi.

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  • Received 18 December 2023
  • Revised 18 March 2024
  • Accepted 9 April 2024

DOI:https://doi.org/10.1103/PhysRevB.109.184306

©2024 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Electron-phonon couplingNestingPhonons
  1. Physical Systems
HelimagnetsSingle crystal materials
  1. Techniques
Density functional theoryInelastic neutron scatteringNonresonant inelastic x-ray scattering
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Nazir Khan1,*, O. De la Peña-Seaman2, Rolf Heid1, David Voneshen3,4, Ayman H. Said5, Andreas Bauer6,7, Tobias Konrad6, Michael Merz1,8, Thomas Wolf1, C. Pfleiderer6,7,9,10, and Frank Weber1,†

  • 1Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
  • 2Instituto de Fisica, Benemerita Universidad Autonoma de Puebla, Apartado Postal J-48, 72570 Puebla, Puebla, Mexico
  • 3ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, United Kingdom
  • 4Department of Physics, Royal Holloway University of London, Egham TW20 0EX, United Kingdom
  • 5Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 6Physik Department, Technische Universität München, D-85748 Garching, Germany
  • 7Centre for Quantum Engineering (ZQE), Technische Universität München, D-85748 Garching, Germany
  • 8Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology, D-76131 Karlsruhe, Germany
  • 9MCQST, Technische Universität München, D-85748 Garching, Germany
  • 10Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, D-85748 Garching, Germany

  • *nazirkhan91@gmail.com
  • †frank.weber@kit.edu

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Vol. 109, Iss. 18 — 1 May 2024

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