Decoupled spin dynamics in the rare-earth orthoferrite : Evolution of magnetic excitations through the spin-reorientation transition
Abstract
In this study, we present a comprehensive study of magnetic dynamics in the rare-earth orthoferrite YbFeO3 at temperatures below and above the spin-reorientation (SR) transition TSR=7.6K, in magnetic fields applied along the a,b, and c axes. Using single-crystal inelastic neutron scattering, we observed that the spectrum of magnetic excitations consists of two collective modes well separated in energy: 3D gapped magnons with a bandwidth of ~60meV, associated with the antiferromagnetically (AFM) ordered Fe subsystem, and quasi-1D AFM fluctuations of ~1meV within the Yb subsystem, with no hybridization of those modes. The spin dynamics of the Fe subsystem changes very little through the SR transition and could be well described in the frame of semiclassical linear spin-wave theory. On the other hand, the rotation of the net moment of the Fe subsystem at TSR drastically changes the excitation spectrum of the Yb subsystem, inducing the transition between two regimes with magnon and spinonlike fluctuations. At T < TSR, the Yb spin chains have a well defined field-induced ferromagnetic (FM) ground state, and the spectrum consists of a sharp single-magnon mode, a two-magnon bound state, and a two-magnon continuum, whereas at T > TSR only a gapped broad spinonlike continuum dominates themore »
- Authors:
-
- Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Technische Univ. Dresden, Dresden (Germany)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Kirensky Institute of Physics, Krasnoyarsk (Russia)
- Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany)
- Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany); China Institute of Atomic Energy, Beijing (People's Republic of China)
- Paul Scherrer Inst. (PSI), Villigen (Switzerland)
- National Academy of Sciences, Minsk (Belarus)
- Technische Univ. Dresden, Dresden (Germany)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1468181
- Alternate Identifier(s):
- OSTI ID: 1466866
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 6; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Nikitin, Stanislav E., Wu, L. S., Sefat, Athena Safa, Shaykhutdinov, Kirill A., Lu, Z., Meng, Siqin, Pomjakushina, Ekaterina V., Conder, Kazimierz, Ehlers, Georg, Lumsden, Mark D., Kolesnikov, Alexander I., Barilo, Sergei, Guretskii, S. A., Inosov, Dmytro S., and Podlesnyak, Andrey A. Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition. United States: N. p., 2018.
Web. doi:10.1103/PhysRevB.98.064424.
Nikitin, Stanislav E., Wu, L. S., Sefat, Athena Safa, Shaykhutdinov, Kirill A., Lu, Z., Meng, Siqin, Pomjakushina, Ekaterina V., Conder, Kazimierz, Ehlers, Georg, Lumsden, Mark D., Kolesnikov, Alexander I., Barilo, Sergei, Guretskii, S. A., Inosov, Dmytro S., & Podlesnyak, Andrey A. Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition. United States. https://doi.org/10.1103/PhysRevB.98.064424
Nikitin, Stanislav E., Wu, L. S., Sefat, Athena Safa, Shaykhutdinov, Kirill A., Lu, Z., Meng, Siqin, Pomjakushina, Ekaterina V., Conder, Kazimierz, Ehlers, Georg, Lumsden, Mark D., Kolesnikov, Alexander I., Barilo, Sergei, Guretskii, S. A., Inosov, Dmytro S., and Podlesnyak, Andrey A. Mon .
"Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition". United States. https://doi.org/10.1103/PhysRevB.98.064424. https://www.osti.gov/servlets/purl/1468181.
@article{osti_1468181,
title = {Decoupled spin dynamics in the rare-earth orthoferrite YbFeO3: Evolution of magnetic excitations through the spin-reorientation transition},
author = {Nikitin, Stanislav E. and Wu, L. S. and Sefat, Athena Safa and Shaykhutdinov, Kirill A. and Lu, Z. and Meng, Siqin and Pomjakushina, Ekaterina V. and Conder, Kazimierz and Ehlers, Georg and Lumsden, Mark D. and Kolesnikov, Alexander I. and Barilo, Sergei and Guretskii, S. A. and Inosov, Dmytro S. and Podlesnyak, Andrey A.},
abstractNote = {In this study, we present a comprehensive study of magnetic dynamics in the rare-earth orthoferrite YbFeO3 at temperatures below and above the spin-reorientation (SR) transition TSR=7.6K, in magnetic fields applied along the a,b, and c axes. Using single-crystal inelastic neutron scattering, we observed that the spectrum of magnetic excitations consists of two collective modes well separated in energy: 3D gapped magnons with a bandwidth of ~60meV, associated with the antiferromagnetically (AFM) ordered Fe subsystem, and quasi-1D AFM fluctuations of ~1meV within the Yb subsystem, with no hybridization of those modes. The spin dynamics of the Fe subsystem changes very little through the SR transition and could be well described in the frame of semiclassical linear spin-wave theory. On the other hand, the rotation of the net moment of the Fe subsystem at TSR drastically changes the excitation spectrum of the Yb subsystem, inducing the transition between two regimes with magnon and spinonlike fluctuations. At T < TSR, the Yb spin chains have a well defined field-induced ferromagnetic (FM) ground state, and the spectrum consists of a sharp single-magnon mode, a two-magnon bound state, and a two-magnon continuum, whereas at T > TSR only a gapped broad spinonlike continuum dominates the spectrum. In this work we show that a weak quasi-1D coupling within the Yb subsystem JYb-Yb, mainly neglected in previous studies, creates unusual quantum spin dynamics on the low-energy scales. The results of our work may stimulate further experimental search for similar compounds with several magnetic subsystems and energy scales, where low-energy fluctuations and underlying physics could be “hidden” by a dominating interaction.},
doi = {10.1103/PhysRevB.98.064424},
journal = {Physical Review B},
number = 6,
volume = 98,
place = {United States},
year = {Mon Aug 27 00:00:00 EDT 2018},
month = {Mon Aug 27 00:00:00 EDT 2018}
}
Web of Science
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