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Title: Lattice dynamics in the double-helix antiferromagnet FeP

Journal Article · · Physical Review Research
 [1];  [2];  [3];  [4];  [3];  [5];  [5];  [6];  [7];  [7];  [8]; ORCiD logo [4]; ORCiD logo [5]
  1. Max Planck Society, Dresden (Germany). Max Planck Inst. for Chemical Physics of Solids; Technische Universität Dresden (Germany)
  2. Max Planck Society, Dresden (Germany). Max Planck Inst. for Chemical Physics of Solids; Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Russian Academy of Sciences (RAS), Krasnoyarsk (Russian Federation)
  4. Univ. of Colorado, Boulder, CO (United States)
  5. Technische Universität Dresden (Germany)
  6. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  7. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany); Moscow State Univ., Moscow (Russian Federation)
  8. Leibniz Inst. for Solid State and Materials Research (IFW), Dresden (Germany)

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.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Russian Science Foundation; Russian Foundation for Basic Research; German Research Foundation (DFG)
Grant/Contract Number:
SC0006939; 19-43-04129; 18-33-01282; AS 5234-1
OSTI ID:
1737858
Alternate ID(s):
OSTI ID: 1842481
Journal Information:
Physical Review Research, Vol. 2, Issue 4; ISSN 2643-1564
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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