• DOI:10.1103/physrevresearch.2.043405
• Corpus ID: 221703272

Lattice dynamics in the double-helix antiferromagnet FeP

@article{Sukhanov2020LatticeDI,
  title={Lattice dynamics in the double-helix antiferromagnet FeP},
  author={A. S. Sukhanov and S E Nikitin and M. S. Pavlovskiĭ and T. Sterling and Nikita D. Andryushin and Alistair S. Cameron and Yu. V. Tymoshenko and Helen C. Walker and Igor V. Morozov and I. O. Chernyavskii and Saicharan Aswartham and Dmitry Reznik and Dmytro S. Inosov},
  journal={Physical Review Research},
  year={2020}
}

• A. Sukhanov, S. Nikitin, +10 authors D. Inosov
• Published 15 September 2020
• Physics
• Physical Review Research

We present a comprehensive investigation of lattice dynamics in the double-helix antiferromagnet FeP by means of high-resolution time-of-flight neutron spectroscopy and ab-initio calculations. Phonons can hybridize with the magnetic excitations in noncollinear magnets to significantly influence their properties. We observed a rich spectrum of phonon excitations, which extends up to $\sim$50 meV. We performed detailed analysis of the observed and calculated spectra for all high-symmetry points and high-symmetry directions of the Brillouin zone. We show that the DFT calculations quantitatively capture the essential features of the observed phonons, including both dispersions and scattering intensities. By making use of the detailed intensity comparison between the theory and the data, we were able to identify displacement vectors for the majority of the observed modes. The overall excellent agreement between the DFT predictions and the experimental results breaks down for the lowest mode at the $Y$-point, whose energy is lower than calculated by $\sim$13%. The present study provides vital information on the lattice dynamics in FeP and demonstrates applicability of the DFT to novel pressure-induced phenomena in related materials, such as MnP and CrAs.