Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Spin Structures and Magnetic Phase Transitions I
MA 5.9: Vortrag
Montag, 18. März 2024, 11:45–12:00, EB 202
Magnetic phase transitions in TbFeO3 — •Johanna Jochum1, Michal Stekiel2, Alexander Engelhardt3, Astrid Schneidewind2, and Christian Pfleiderer1,3 — 1Heinz Maier-Leibnitz Zentrum, Technische Universität München, 85748 Garching — 2JCNS-MLZ, Forschungszentrum Jülich GmbH, Outstation Garching, 85748 Garching — 3Physik Department, Technische Universität München, 85748 Garching
Rarearth (RE) orthoferrite have been studied widely due to their multiferroic properties [1] on the one hand and on the other hand owing to a series of magnetic transitions, which follow from the interaction between the magnetic sublattices of the Fe and RE atoms [2]. The latter manifests in partial ordering and spin reorientation transitions of these sublattices. TbFeO3 in particular, shows two spin-reorientation transitions. In the high temperature phase (HT) only the Fe sublattice is magnetically ordered. At the first transition, the Fe sublattice polarizes the Tb ions leading to a rotation of the spins of both system towards the crystallographic b axis (IT). At 3K the Tb sublattice orders antiferromagnetically, and the Fe sublattice returns to its high temperature state (LT) [3]. We have studied these spin-reorientation transitions in TbFeO3 as a function of magnetic field using neutron diffraction. The data suggest that the transition from HT to the IT is suppressed as the magnetic field isincrease, leading to strong fluctuations that extend to temperatures beyond the zero field transition.
[1] Y. Ke, et al., Sci. Rep. 6, 19775 (2016) [2] R. L. White, JAP 40, 1061 (1969) [3] A. K. Ovsianikov et al., JMMM 563 170025 (2022)
Keywords: Neutron Scattering; Rare earth oxide; Spin reorientation transition