Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.30: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Magnetic phase transitions and spin-driven multiferroicity in BaHoFeO4 — •Filip Kadlec1, Christelle Kadlec1, Toan Dang2, Denis Kozlenko3, T.P. Hoang2, Sergei Kichanov3, LTP Thao4, TL Phan5, N Tran2, Tomáš Kmječ6, Jaroslav Kohout6, Vojtěch Chlan6, and Manh-Huong Phan7 — 1Institute of Physics CAS, Prague, Czechia — 2Duy Tan Univ., Danang, Vietnam — 3Dubna, Russia — 4Univ. of Danang, Vietnam — 5VNU Hanoi, Vietnam — 6Fac.of Mathematics and Physics, Charles Univ., Prague — 7Univ.of South Florida, Tampa, USA
Magnetic and multiferroic properties of BaHoFeO4 originate in geometrical frustration and in interactions between Fe and Ho sublattices. The magnetic phase transitions remind of the parent compound BaYFeO4 which exhibits an AFM order below the Néel temperature of 48 K. Below 3K, in magnetic field above 1.5 T, specific changes in the magnetic configuration lead to a spin- and H-induced ferroelectric polarization. As magnetic field increases, the ferroelectric polarization peaks, and it disappears above 5 T. Such an unusual ferroelectric behavior is likely related to H-induced metamagnetic phase transitions. We studied polycrystalline BaHoFeO4 using THz time-domain spectroscopy, X-ray diffraction, neutron powder diffraction, Mössbauer spectroscopy and magnetization measurements. Three different AFM structures were observed on cooling, as well as two metamagnetic phase transitions induced by magnetic field of up to 7 T. In view of the proven robustness of the sublattice of Fe spins, these changes of magnetic configurations are attributed to the frustrated Ho-spin sublattice.
Keywords: metamagnetic phase transition; antiferromagnetic order; Fe and Ho sublattices; terahertz time-domain spectroscopy; frustration