Lattice and spin excitations in multiferroic h-YMnO3

C. Toulouse; L. Chaix; J. Liu; Y. Gallais; M-A. Measson; A. Sacuto; L. Pinsard-Godart; F. Willaert; J. B. Brubach; P. Roy; S. Petit; V. Simonet; S. de Brion; M. Cazayous

doi:10.1103/PhysRevB.89.094415

Lattice and spin excitations in multiferroic h-YMnO3

Strongly Correlated Electrons 2018-11-13 v1 Materials Science

Authors: C. Toulouse , L. Chaix , J. Liu , Y. Gallais , M-A. Measson , A. Sacuto , L. Pinsard-Godart , F. Willaert , J. B. Brubach , P. Roy , S. Petit , V. Simonet , S. de Brion , M. Cazayous

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Abstract

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 anti-crossing between magnon and acoustic phonon branches measured by neutron. These optical measurements underly the unusual strong spin-phonon coupling.

Keywords

phonon modes and lattice dynamics

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@article{arxiv.1402.7239,
  title  = {Lattice and spin excitations in multiferroic h-YMnO3},
  author = {C. Toulouse and L. Chaix and J. Liu and Y. Gallais and M-A. Measson and A. Sacuto and L. Pinsard-Godart and F. Willaert and J. B. Brubach and P. Roy and S. Petit and V. Simonet and S. de Brion and M. Cazayous},
  journal= {arXiv preprint arXiv:1402.7239},
  year   = {2018}
}

Lattice and spin excitations in multiferroic h-YMnO3

Abstract

Keywords

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