Seemingly anisotropic magnetodielectric effect in isotropic EuTiO.sub.3./sub. ceramics

0533605 - FZÚ 2021 RIV US eng J - Journal Article
Repček, Dalibor - Kadlec, Christelle - Kadlec, Filip - Savinov, Maxim - Kachlík, M. - Drahokoupil, Jan - Proschek, P. - Prokleška, J. - Máca, K. - Kamba, Stanislav
Seemingly anisotropic magnetodielectric effect in isotropic EuTiO₃ ceramics.
Physical Review B. Roč. 102, č. 14 (2020), s. 1-8, č. článku 144402. ISSN 2469-9950. E-ISSN 2469-9969
R&D Projects: GA MŠMT(CZ) EF16_019/0000760; GA ČR GA18-09265S; GA MŠMT(CZ) LM2018096
Grant - others:OP VVV - SOLID21(XE) CZ.02.1.01/0.0/0.0/16_019/0000760
Institutional support: RVO:68378271
Keywords : magnetodielectric effect * magnetoelectrics * THz spectroscopy * IR spectroscopy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 4.036, year: 2020
Method of publishing: Limited access
https://doi.org/10.1103/PhysRevB.102.144402

In the antiferromagnetic phase of EuTiO3 ceramics, a seemingly anisotropic magnetodielectric effect (up to 2.5%) was observed via the low-frequency dielectric permittivity measured in external magnetic field below 1.9 T.We explain the effect theoretically by taking into account the demagnetizing field which effectively reduces the internal magnetic flux density by 0.6 T when the external magnetic field is applied perpendicular to the plane of the disk-shaped sample. The refractive index between 0.2 and 0.5 THz exhibits a large anisotropy in an external magnetic field of up to 7 T. This anisotropy is due to a shift of the ferromagnetic resonance from the microwave to the sub-THz region with external magnetic field applied perpendicular to the magnetic component of the THz radiation. This magnon observation is performed in the strong external magnetic field (above 2 T) and in both paramagnetic and antiferromagnetic phases.

Permanent Link: http://hdl.handle.net/11104/0311944