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  Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge

Sukhanov, A. S., Pavlovskii, M. S., Bourges, P., Walker, H. C., Manna, K., Felser, C., et al. (2019). Magnon-polaron excitations in the noncollinear antiferromagnet Mn3Ge. Physical Review B, 99(21): 214445, pp. 1-9. doi:10.1103/PhysRevB.99.214445.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-8308-F Version Permalink: http://hdl.handle.net/21.11116/0000-0004-8474-4
Genre: Journal Article

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 Creators:
Sukhanov, A. S.1, Author              
Pavlovskii, M. S.2, Author
Bourges, Ph2, Author
Walker, H. C.2, Author
Manna, K.1, Author              
Felser, C.3, Author              
Inosov, D. S.2, Author
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2External Organizations, ou_persistent22              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 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 similar to 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.

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Language(s): eng - English
 Dates: 2019-06-282019-06-28
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevB.99.214445
 Degree: -

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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 99 (21) Sequence Number: 214445 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008