Magnetostructural coupling in RFeO3 (R = Nd, Tb, Eu and Gd)

We investigate the interplay of magnetization and lattice vibrations in rare-earth orthoferrites R FeO 3 , with a specific focus on non-symmetry-breaking anomalies. To do so, we study the magnetization, magnon excitations and lattice dynamics as a function of temperature in NdFeO 3 , TbFeO 3 , EuFeO...

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Bibliographic Details
Published in:Scientific reports 2022-06, Vol.12 (1), p.9697-9697, Article 9697
Main Authors: Vilarinho, R., Weber, M. C., Guennou, M., Miranda, A. C., Dias, C., Tavares, P., Kreisel, J., Almeida, A., Moreira, J. Agostinho
Format: Article
Language:English
Subjects:
639/301/119
639/766/119/2795
639/766/119/997
639/766/930/527/1821
Anisotropy
Crystal structure
Earth
High temperature
Humanities and Social Sciences
Iron
Magnetism
multidisciplinary
Phase transitions
Science
Science (multidisciplinary)
Symmetry
Vibrations
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Summary:We investigate the interplay of magnetization and lattice vibrations in rare-earth orthoferrites R FeO 3 , with a specific focus on non-symmetry-breaking anomalies. To do so, we study the magnetization, magnon excitations and lattice dynamics as a function of temperature in NdFeO 3 , TbFeO 3 , EuFeO 3 and GdFeO 3 . The magnetization shows distinct temperature anomalous behavior for all investigated rare-earth orthoferrites, even in the compounds with no phase transitions occurring at those temperatures. Through spin–phonon coupling, these magnetic changes are mirrored by the FeO 6 rotation mode for all the studied R FeO 3 , revealing a common magnetostructural effect associated with the octahedra rotations. The R 3+ oscillation modes evidence a Fe 3+ /R 3+ spins cross-talk for the NdFeO 3 and TbFeO 3 cases. Our work sheds light into the common magnetostructural coupling in rare-earth orthoferrites, and the important role of magnetic anisotropy and spin–orbit coupling strength of the R –Fe interactions on the spin-reorientation transition at high temperatures.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-13097-1