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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 8: Multiferroics and Magnetoelectric Coupling I (joint session MA/KFM)
KFM 8.3: Vortrag
Mittwoch, 18. März 2020, 10:00–10:15, HSZ 401
Magneto-electric properties and low-energy excitations of multiferroic FeCr2S4 — •Ana Strinic1, Stephan Reschke1, Zhe Wang1, Michael Schmid1, Alois Loidl1, Vladimir Tsurkan1,2, and Joachim Deisenhofer1 — 1Experimental Physics V, Center for Electronic Correlations and Magnetism, University of Augsburg, D-86159 Augsburg, Germany — 2Institute of Applied Physics, Academy of Sciences of Moldova, MD-2028 Chisinau, Republic of Moldova
FeCr2S4 is under investigation for over four decades and shows remarkable magnetic as well as electronic properties. While a paramagnetic state is present at room temperature, for low temperatures long-range ferromagnetic order stets in and is followed by an incommensurate magnetic structure. Below T = 10 K a multiferroic ground state with orbital ordering is reached and IR phonons indicate a loss of inversion symmetry [1][2][3]. We report on the low-frequency optical excitations measured by THz spectroscopy. We measured the magnetic field dependence within the temperature range of orbital ordering and the temperature dependence of the different phases within the H-T-phase diagram for several polarizations of the THz-radiation in relation to the applied magnetic field. We will discuss the origin of the low-energy excitations and their relation with multiferroic properties of FeCr2S4.
[1] J. Bertinshaw et al., Scientific Reports, 4, (2014).
[2] L. Lin et al., Scientific Reports, 4, (2014).
[3] J. Deisenhofer et. al., Physical Review B, 100, (2019).