Interplay between spin dynamics and crystal field in multiferroic compound HoMnO${}_3$

Abstract

In the multiferroic hexagonal manganite HoMnO3, inelastic neutron scattering and synchrotron based THz spectroscopy have been used to investigate the spin waves associated to the Mn order together with Ho crystal field excitations. While the Mn order sets in first below 80 K, a spin reorientation occurs below 37 K, a rare feature in the rare earth manganites. We show that severalHo crystal field excitations are present in the same energy range as the magnons, and that they are all affected by the spin reorientation. Moreover, several anomalous features are observed in the excitations at low temperature. Our analysis and calculations for the Mn spin waves and Ho crystal field excitations support Mn-Ho coupling mechanisms as well as coupling to the lattice affecting the dynamics.

References in corpus (9)

• Dynamical magneto-electric coupling in helical magnets
• Spin model of magnetostrictions in multiferroic Mn perovskites
• Theory of electromagnon in the multiferroic Mn perovskites: Vital role of higher harmonic components of the spiral spin order
• The nature of Ho magnetism in multiferroic HoMnO3
• Electromagnon dispersion probed by inelastic x-ray scattering
• Spin dependence of ferroelectric polarization in the double exchange model for manganites
• A model of magnetic order in hexagonal HoMnO3
• Infrared-active excitations related to Ho3+ ligand-field splitting at the commensurate-incommensurate magnetic phase transition in HoMn2O5
• Asymmetric splitting of an antiferromagnetic resonance via quartic exchange interactions in multiferroic hexagonal HoMnO${}_3$

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