Spin-Charge-Lattice Coupling across the Charge Density Wave Transition in a Kagome Lattice Antiferromagnet.
| Autor: | Teng X; Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA., Tam DW; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen, Switzerland., Chen L; Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA., Tan H; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Xie Y; Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA., Gao B; Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA., Granroth GE; Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA., Ivanov A; Institut Laue-Langevin, 71 avenue des Martyrs CS 20156, 38042 Grenoble Cedex 9, France., Bourges P; Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France., Yan B; Department of Condensed Matter Physics, Weizmann Institute of Science, Rehovot 7610001, Israel., Yi M; Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA., Dai P; Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2024 Jul 26; Vol. 133 (4), pp. 046502. |
| DOI: | 10.1103/PhysRevLett.133.046502 |
| Abstrakt: | 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. We use neutron scattering to study the evolution of spin and lattice excitations across the CDW transition T_{CDW} 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 T_{CDW} 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. |
| Databáze: | MEDLINE |
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