Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.1103/PhysRevB.106.184404
Аннотация: The low-temperature spin dynamics of the orthorhombic TbFeO3 perovskite has been studied. It has been found that the inelastic neutron scattering (INS) spectrum of the investigated compound contains two modes corresponding to different sublattices. It is shown that the iron subsystem orders antiferromagnetically at TN=632 K and exhПоказать полностьюibits the high-energy magnon dispersion. The magnetic dynamics of this subsystem has been described within the linear spin wave theory and the in-plane and out-of-plane exchange anisotropy has been demonstrated. The approach proposed previously to describe the magnon dispersion in the TmFeO3 compound has been used. Three levels of the nondispersive crystal electric field corresponding to Tb3+ ions have been found in the energy region below 40 meV at about 17, 26, and 35 meV. The behavior of the magnetic correlation length of the terbium subsystem has been determined by studying the diffuse scattering at different temperatures. The evolution of this subsystem has been numerically described within the point charge model. It is shown that the numerical data agree satisfactorily with the experiment and with the general concept of the single-ion approximation applied to the rare-earth subsystem of orthorhombic perovskites. © 2022 American Physical Society.
Журнал: Physical Review B
Выпуск журнала: Vol. 106, Is. 18
Номера страниц: 184404
ISSN журнала: 24699950
Издатель: American Physical Society