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Spin-Charge-Lattice Coupling across the Charge Density Wave Transition in a Kagome Lattice Antiferromagnet

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [3];  [1];  [1];  [4];  [5];  [6];  [3];  [1];  [1]
  1. Rice Univ., Houston, TX (United States)
  2. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  3. Weizmann Institute of Science, Rehovot (Israel)
  4. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  5. Inst. Laue-Langevin (ILL), Grenoble (France)
  6. Univ. Paris-Saclay, Gif-sur-Yvette (France)
+ Show Author Affiliations
Understanding spin and lattice excitations in a metallic magnetic ordered system forms the basis to unveil the magnetic and lattice exchange couplings and their interactions with itinerant electrons. Kagome lattice antiferromagnet FeGe is interesting because it displays a rare charge density wave (CDW) deep inside the antiferromagnetic ordered phase that interacts with the magnetic order. Here, we use neutron scattering to study the evolution of spin and lattice excitations across the CDW transition 𝑇CDW in FeGe. While spin excitations below ∼100  meV can be well described by spin waves of a spin-1 Heisenberg Hamiltonian, spin excitations at higher energies are centered around the Brillouin zone boundary and extend up to ∼180  meV consistent with quasiparticle excitations across spin-polarized electron-hole Fermi surfaces. Furthermore, 𝑐-axis spin wave dispersion and Fe-Ge optical phonon modes show a clear hardening below 𝑇CDW due to spin-charge-lattice coupling but with no evidence of a phonon Kohn anomaly. By comparing our experimental results with density functional theory calculations in absolute units, we conclude that FeGe is a Hund’s metal in the intermediate correlated regime where magnetism has contributions from both itinerant and localized electrons arising from spin polarized electronic bands near the Fermi level.
Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
SC0021421
OSTI ID:
3013415
Alternate ID(s):
OSTI ID: 2474452
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 133; ISSN 1079-7114; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

charge density waves
magnetic coupling
magnetic order