Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge
Sukhanov AS, Pavlovskii MS, Bourges P, Walker HC, Manna K, Felser C, Inosov DS (2019)
Publication Type: Journal article
Publication year: 2019
Journal
Book Volume: 99
Article Number: 214445
Journal Issue: 21
DOI: 10.1103/PhysRevB.99.214445
Abstract
We present detailed inelastic neutron scattering measurements of the noncollinear antiferromagnet Mn3Ge. Time-of-flight and triple-axis spectroscopy experiments were conducted at the temperature of 6 K, well below the high magnetic ordering temperature of 370 K. The magnetic excitations have a 5-meV gap and display an anisotropic dispersive mode reaching ∼90 meV at the boundaries of the magnetic Brillouin zone. The spectrum at the zone center shows two additional excitations that demonstrate characteristics of both magnons and phonons. Ab initio lattice-dynamics calculations show that these can be associated with the magnon-polaron modes resulting from the hybridization of the spin fluctuations and the low-energy optical phonons. The observed magnetoelastic coupling agrees with the previously found negative thermal expansion in this compound and resembles the features reported in the spectroscopic studies of other antiferromagnets with similar noncollinear spin structures.
Involved external institutions
Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
École Polytechnique - Université Paris-Saclay
France (FR)
Rutherford Appleton Laboratory
United Kingdom (GB)
Technische Universität Dresden
Germany (DE)
Germany (DE)
Russian Academy of Sciences / Росси́йская акаде́мия нау́к (RAS)
Russian Federation (RU)
École Polytechnique - Université Paris-Saclay
France (FR)
Rutherford Appleton Laboratory
United Kingdom (GB)
Technische Universität Dresden
Germany (DE)
How to cite
APA:
Sukhanov, A.S., Pavlovskii, M.S., Bourges, P., Walker, H.C., Manna, K., Felser, C., & Inosov, D.S. (2019). Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge. Physical Review B, 99(21). https://doi.org/10.1103/PhysRevB.99.214445
MLA:
Sukhanov, A. S., et al. "Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge." Physical Review B 99.21 (2019).
BibTeX: Download