Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phases

L. Peedu, V. Kocsis, D. Szaller, J. Viirok, U. Nagel, T. Rõõm, D. G. Farkas, S. Bordács, D. L. Kamenskyi, U. Zeitler, Y. Tokunaga, Y. Taguchi, Y. Tokura, I. Kézsmárki

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Spin excitations of magnetoelectric LiNiPO4 are studied by infrared absorption spectroscopy in the THz spectral range as a function of magnetic field through various commensurate and incommensurate magnetically ordered phases up to 33 T. Six spin resonances and a strong two-magnon continuum are observed in zero magnetic field. Our systematic polarization study reveals that some of the excitations are usual magnetic-dipole active magnon modes, while others are either electromagnons, being only electric-dipole active, or magnetoelectric, that is both electric- and magnetic-dipole active spin excitations. Field-induced shifts of the modes for all three orientations of the field along the orthorhombic axes allow us to refine the values of the relevant exchange couplings, single-ion anisotropies, and the Dzyaloshinskii-Moriya interaction on the level of a four-sublattice mean-field spin model. This model also reproduces the spectral shape of the two-magnon absorption continuum, found to be electric-dipole active in the experiment.

Original languageEnglish
Article number024406
JournalPhysical Review B
Volume100
Issue number2
DOIs
Publication statusPublished - Jul 8 2019

Fingerprint

electric dipoles
Magnetic fields
magnetic dipoles
Exchange coupling
Infrared absorption
Absorption spectroscopy
continuums
excitation
Infrared spectroscopy
spin resonance
Anisotropy
Ions
Polarization
magnetic fields
sublattices
infrared absorption
absorption spectroscopy
infrared spectroscopy
anisotropy
Experiments

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phases. / Peedu, L.; Kocsis, V.; Szaller, D.; Viirok, J.; Nagel, U.; Rõõm, T.; Farkas, D. G.; Bordács, S.; Kamenskyi, D. L.; Zeitler, U.; Tokunaga, Y.; Taguchi, Y.; Tokura, Y.; Kézsmárki, I.

In: Physical Review B, Vol. 100, No. 2, 024406, 08.07.2019.

Research output: Contribution to journalArticle

Peedu, L, Kocsis, V, Szaller, D, Viirok, J, Nagel, U, Rõõm, T, Farkas, DG, Bordács, S, Kamenskyi, DL, Zeitler, U, Tokunaga, Y, Taguchi, Y, Tokura, Y & Kézsmárki, I 2019, 'Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phases', Physical Review B, vol. 100, no. 2, 024406. https://doi.org/10.1103/PhysRevB.100.024406
Peedu L, Kocsis V, Szaller D, Viirok J, Nagel U, Rõõm T et al. Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phases. Physical Review B. 2019 Jul 8;100(2). 024406. https://doi.org/10.1103/PhysRevB.100.024406
Peedu, L. ; Kocsis, V. ; Szaller, D. ; Viirok, J. ; Nagel, U. ; Rõõm, T. ; Farkas, D. G. ; Bordács, S. ; Kamenskyi, D. L. ; Zeitler, U. ; Tokunaga, Y. ; Taguchi, Y. ; Tokura, Y. ; Kézsmárki, I. / Spin excitations of magnetoelectric LiNiPO4 in multiple magnetic phases. In: Physical Review B. 2019 ; Vol. 100, No. 2.
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