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Title: Decoupled spin dynamics in the rare-earth orthoferrite YbFeO 3 : Evolution of magnetic excitations through the spin-reorientation transition

Journal Article · · Physical Review B
 [1]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4];  [5];  [6];  [6]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [7];  [7];  [8]; ORCiD logo [2]
  1. Max Planck Institute for Chemical Physics of Solids, Dresden (Germany); Technische Univ. Dresden, Dresden (Germany)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Kirensky Institute of Physics, Krasnoyarsk (Russia)
  4. Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany)
  5. Helmholtz-Zentrum Berlin fur Materialien und Energie, Berlin (Germany); China Institute of Atomic Energy, Beijing (People's Republic of China)
  6. Paul Scherrer Inst. (PSI), Villigen (Switzerland)
  7. National Academy of Sciences, Minsk (Belarus)
  8. Technische Univ. Dresden, Dresden (Germany)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1468181
Alternate ID(s):
OSTI ID: 1466866
Journal Information:
Physical Review B, Vol. 98, Issue 6; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (3)

Magnetic behavior and complete high-field magnetic phase diagram of the orthoferrite ErFeO 3 journal August 2019
Low-temperature spin dynamics in the TmFeO 3 orthoferrite with a non-Kramers ion journal January 2020
Antiferromagnetic ordering and dipolar interactions of YbAlO 3 journal May 2019

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