Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2014

Lattice and spin excitations in multiferroic h-YMnO3

Laura Chaix
Jean-Blaise Brubach
Pascale Roy

Résumé

We used Raman and terahertz spectroscopies to investigate lattice and magnetic excitations and their cross coupling in the hexagonal YMnO3 multiferroic. Two phonon modes are strongly affected by the magnetic order. Magnon excitations have been identified thanks to comparison with neutron measurements and spin-wave calculations but no electromagnon has been observed. In addition, we evidenced two additional Raman-active peaks. We have compared this observation with the anticrossing between magnon and acoustic-phonon branches measured by neutron. These optical measurements underlie the unusual strong spin-phonon coupling.

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hal-00985234 , version 1 (08-04-2026)

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Constance Toulouse, Jiaji Liu, Yann Gallais, Marie-Aude Measson, Alain Sacuto, et al.. Lattice and spin excitations in multiferroic h-YMnO3. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2014, 89 (9), pp.094415. ⟨10.1103/PhysRevB.89.094415⟩. ⟨hal-00985234⟩
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