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

Skorobogatov, S.; Nikitin, Stanislav E.; Shaykhutdinov, Kirill; Balayev, A. D.; Terentjev, K. Yu.; Ehlers, Georg; Sala, Gabriele; Pomjakushina, Ekaterina; Conder, Kazimierz; Podlesnyak, Andrey A.

doi:10.1103/PhysRevB.101.014432

Title: Low-temperature spin dynamics in the ${TmFeO}_{3}$ orthoferrite with a non-Kramers ion

Journal Article · Wed Jan 22 00:00:00 UTC 2020 · Physical Review B

DOI: https://doi.org/10.1103/PhysRevB.101.014432 · OSTI ID:1606844

Skorobogatov, S. ^[1]; Nikitin, Stanislav E. ^[2]; Shaykhutdinov, Kirill ^[3]; Balayev, A. D. ^[3]; Terentjev, K. Yu. ^[3];

^[4];

^[4]; Pomjakushina, Ekaterina ^[5]; Conder, Kazimierz ^[5];

^[4]

Federal Research Center, Krasnoyarsk (Russia). Kirensky Inst. of Physics; Siberian Federal Univ., Krasnoyarsk (Russia). Dept. of Solid State Physics and Nanotechnology, Inst. of Engineering Physics and Radioelectronics
Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Dresden Univ. of Technology (Germany)
Federal Research Center, Krasnoyarsk (Russia). Kirensky Inst. of Physics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Technologies Division
Paul Scherrer Inst. (PSI), Villigen (Switzerland)

We investigate the magnetic dynamics of the orthorhombic perovskite TmFeO₃ at low temperatures, below the spin reorientation transition at TSR≈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 TN~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 ~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 (0KL) 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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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1606844

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 1 Vol. 101; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Low-temperature spin dynamics in the TmFeO 3 orthoferrite with a non-Kramers ion

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Title: Low-temperature spin dynamics in the ${TmFeO}_{3}$ orthoferrite with a non-Kramers ion