Spin and lattice dynamics of multiferroic SrMn.sub.7./sub.O.sub.12./sub. studied by THz and infrared spectroscopies at low temperatures and in magnetic field

0521689 - FZÚ 2020 RIV US eng C - Conference Paper (international conference)
Kadlec, Filip - Goian, Veronica - Nuzhnyy, Dmitry - Kadlec, Christelle - Vít, Jakub - Borodavka, Fedir - Glazkova, I.S. - Belik, A.A. - Kamba, Stanislav
Spin and lattice dynamics of multiferroic SrMn₇O₁₂ studied by THz and infrared spectroscopies at low temperatures and in magnetic field.
2019 International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) /44./. New York: IEEE, 2019, s. 813-814. International Conference on Infrared Millimeter and Terahertz Waves. ISBN 978-1-5386-8286-9. ISSN 2162-2027.
[International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) /44./. Paris (FR), 01.09.2019-06.09.2019]
R&D Projects: GA ČR GA18-09265S; GA MŠMT(CZ) EF16_019/0000760
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : phonons * temperature measurement * magnetic resonance * magnetostriction * magnetoelectric effects
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
https://ieeexplore.ieee.org/document/8874558

Multiferroic SrMn7O12 crystals are isostructural with CaMn 7 O 12 which is known for its unusual symmetry properties and a record-high spin-induced polarization. We studied SrMn 7 O 12 ceramics by THz time-domain and Fourier-transform infrared spectroscopies upon varying temperature and magnetic field. In the magnetic phases, we observed spin waves gaining strength from polar phonons thus, they are assigned to electromagnons. We discuss the observed persistence of several low-temperature vibrational modes above the high-temperature phase transition, and the impact of atomic substitution with regard to CaMn 7 O 12 .

Permanent Link: http://hdl.handle.net/11104/0306279