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Magnetostructural coupling in RFeO3 (R = Nd, Tb, Eu and Gd)
R Vilarinho1, M C Weber2,3, M Guennou4
1IFIMUP, Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, rua do Campo Alegre s/n, 4169-007, Porto, Portugal. rvsilva@fc.up.pt.
Rare-earth orthoferrites exhibit unique magnetic anomalies linked to lattice vibrations. This spin-phonon coupling reveals a common magnetostructural effect across various rare-earth orthoferrites (RFeO3).
Area of Science:
- Solid State Physics
- Materials Science
- Magnetism
Background:
- Rare-earth orthoferrites (RFeO3) are known for complex magnetic behaviors and potential applications.
- Understanding the interplay between magnetic properties and lattice dynamics is crucial for materials design.
Purpose of the Study:
- To investigate the magnetostructural coupling in rare-earth orthoferrites.
- To identify common anomalies in magnetization and lattice vibrations across different RFeO3 compounds.
- To explore the role of R-Fe interactions in magnetic transitions.
Main Methods:
- Temperature-dependent studies of magnetization, magnon excitations, and lattice dynamics.
- Analysis of spin-phonon coupling and magnetostructural effects.
- Investigation of specific compounds: NdFeO3, TbFeO3, EuFeO3, and GdFeO3.
Main Results:
- Observed distinct anomalous magnetic behavior in all studied RFeO3, independent of phase transitions.
- Identified a common magnetostructural effect linked to FeO6 octahedra rotations via spin-phonon coupling.
- Evidence of Fe3+/R3+ spin cross-talk in NdFeO3 and TbFeO3.
Conclusions:
- A common magnetostructural coupling mechanism exists in rare-earth orthoferrites.
- Magnetic anisotropy and spin-orbit coupling strength significantly influence R-Fe interactions and spin-reorientation transitions.
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