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Title: Lattice dynamics in the double-helix antiferromagnet FeP

Abstract

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 ~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 ~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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ORCiD logo
Publication Date:
Research Org.:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Russian Science Foundation; Russian Foundation for Basic Research; German Research Foundation (DFG)
OSTI Identifier:
1737858
Alternate Identifier(s):
OSTI ID: 1842481
Grant/Contract Number:  
SC0006939; 19-43-04129; 18-33-01282; AS 5234-1
Resource Type:
Published Article
Journal Name:
Physical Review Research
Additional Journal Information:
Journal Name: Physical Review Research Journal Volume: 2 Journal Issue: 4; Journal ID: ISSN 2643-1564
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Strongly Correlated Electrons

Citation Formats

Sukhanov, A. S., Nikitin, S. E., Pavlovskii, M. S., Sterling, T. C., Andryushin, N. D., Cameron, A. S., Tymoshenko, Y. V., Walker, H. C., Morozov, I. V., Chernyavskii, I. O., Aswartham, S., Reznik, D., and Inosov, D. S. Lattice dynamics in the double-helix antiferromagnet FeP. United States: N. p., 2020. Web. doi:10.1103/PhysRevResearch.2.043405.
Sukhanov, A. S., Nikitin, S. E., Pavlovskii, M. S., Sterling, T. C., Andryushin, N. D., Cameron, A. S., Tymoshenko, Y. V., Walker, H. C., Morozov, I. V., Chernyavskii, I. O., Aswartham, S., Reznik, D., & Inosov, D. S. Lattice dynamics in the double-helix antiferromagnet FeP. United States. https://doi.org/10.1103/PhysRevResearch.2.043405
Sukhanov, A. S., Nikitin, S. E., Pavlovskii, M. S., Sterling, T. C., Andryushin, N. D., Cameron, A. S., Tymoshenko, Y. V., Walker, H. C., Morozov, I. V., Chernyavskii, I. O., Aswartham, S., Reznik, D., and Inosov, D. S. Tue . "Lattice dynamics in the double-helix antiferromagnet FeP". United States. https://doi.org/10.1103/PhysRevResearch.2.043405.
@article{osti_1737858,
title = {Lattice dynamics in the double-helix antiferromagnet FeP},
author = {Sukhanov, A. S. and Nikitin, S. E. and Pavlovskii, M. S. and Sterling, T. C. and Andryushin, N. D. and Cameron, A. S. and Tymoshenko, Y. V. and Walker, H. C. and Morozov, I. V. and Chernyavskii, I. O. and Aswartham, S. and Reznik, D. and Inosov, D. S.},
abstractNote = {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 ~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 ~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.},
doi = {10.1103/PhysRevResearch.2.043405},
journal = {Physical Review Research},
number = 4,
volume = 2,
place = {United States},
year = {2020},
month = {12}
}

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