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  Low-temperature spin dynamics in the TmFeO3 orthoferrite with a non-Kramers ion

Skorobogatov, S. A., Nikitin, S. E., Shaykhutdinov, K. A., Balaev, A. D., Terentjev, K. Y., Ehlers, G., et al. (2020). Low-temperature spin dynamics in the TmFeO3 orthoferrite with a non-Kramers ion. Physical Review B, 101(1): 014432, pp. 1-8. doi:10.1103/PhysRevB.101.014432.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-9E96-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C36D-5
Genre: Journal Article

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 Creators:
Skorobogatov, S. A.1, Author
Nikitin, S. E.2, Author              
Shaykhutdinov, K. A.1, Author
Balaev, A. D.1, Author
Terentjev, K. Yu.1, Author
Ehlers, G.1, Author
Sala, G.1, Author
Pomjakushina , E. V.1, Author
Conder, K.1, Author
Podlesnyak, A.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: We investigate the magnetic dynamics of the orthorhombic perovskite TmFeO3 at low temperatures, below the spin reorientation transition at T-SR approximate to 80 K, by means of time-of-flight neutron spectroscopy. We find that the magnetic excitation spectrum combines two emergent collective modes associated with different magnetic sublattices. The Fe subsystem orders below T-N similar to 632 K into a canted antiferromagnetic structure and exhibits sharp, high-energy magnon excitations. We describe them using linear spin-wave theory, and reveal a pronounced anisotropy between in- and out-of-plane exchange interactions, which was mainly neglected in previous reports on the spin dynamics in orthoferrites. At lower energies, we find two crystalline electrical field (CEF) excitations of Tm3+ ions at energies of similar to 2 and 5 meV. In contrast to the sister compound YbFeO3, where the Yb3+ ions form quasi-one-dimensional chains along the c axis, the Tm excitations show dispersion along both directions in the (OKL) scattering plane. Analysis of the neutron scattering polarization factor reveals a longitudinal polarization of the 2 meV excitation. To evaluate the effect of the CEF on the Tm3+ ions, we perform point-charge model calculations, and their results quantitatively capture the main features of Tm single-ion physics, such as energies, intensities, and polarization of the CEF transitions, and the type of magnetic anisotropy.

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Language(s): eng - English
 Dates: 2020-01-222020-01-22
 Publication Status: Published in print
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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: 101 (1) Sequence Number: 014432 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008