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

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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).

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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.