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


ABSTRACT: We investigate the interplay of magnetization and lattice vibrations in rare-earth orthoferrites RFeO3, 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 NdFeO3, TbFeO3, EuFeO3 and GdFeO3. 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 FeO6 rotation mode for all the studied RFeO3, revealing a common magnetostructural effect associated with the octahedra rotations. The R3+ oscillation modes evidence a Fe3+/R3+ spins cross-talk for the NdFeO3 and TbFeO3 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.

SUBMITTER: Vilarinho R 

PROVIDER: S-EPMC9188583 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature

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Magnetostructural coupling in RFeO<sub>3</sub> (R = Nd, Tb, Eu and Gd).

Vilarinho R R   Weber M C MC   Guennou M M   Miranda A C AC   Dias C C   Tavares P P   Kreisel J J   Almeida A A   Moreira J Agostinho JA  

Scientific reports 20220611 1


We investigate the interplay of magnetization and lattice vibrations in rare-earth orthoferrites RFeO<sub>3</sub>, 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<sub>3</sub>, TbFeO<sub>3</sub>, EuFeO<sub>3</sub> and GdFeO<sub>3</sub>. The magnetization shows distinct temperature anomalous behavior for all investigated rare-earth orthoferrites, even in the compounds with  ...[more]

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