Regensburg 2019 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 7: Multiferroics
KFM 7.4: Vortrag
Montag, 1. April 2019, 16:00–16:20, H47
Magnetic Structure and Magnetoelectricity in Holmium-Doped Langasite — •Lukas Weymann1, Lorenz Bergen1, Thomas Kain1, Anna Pimenov1, Alexey Shuvaev1, Evan Constable1, David Szaller1, Artem M. Kuzmenko2, Alexander A. Mukhin2, Vsevolod Yu. Ivanov2, Nadezhda V. Kostyuchenko1,3, Maxim Mostovoy4, and Andrei Pimenov1 — 1Institute of Solid State Physics, Vienna University of Technology, 1040 Vienna, Austria — 2A. M. Prokhorov General Physics Institute of Russian Academy of Sciences, 119991 Moscow, Russia — 3Moscow Institute of Physics and Technology, 141700 Dolgoprudny, Moscow region, Russia — 4Theory of Condensed Matter, Zernike Institute for Advanced Materials, 9747 AG Groningen, The Netherlands
The family of the rare-earth langasites R3Ga5SiO14 attracted significant attention due to their intriguing magnetic and magnetoelectric properties. However, in the langasites with only one magnetic sublattice of the rare-earth ions no magnetoelectric effect was observed till now.
In this work we present the results on a magnetoelectric effect, i.e. electric polarization induced by an external magnetic field, in the diluted rare-earth langasite (Ho0.03La0.97)3Ga5SiO14, with an unusual six-fold symmetry. Its rather complex magnetic structure can be resolved via magnetization, torque and dynamic experiments. Magnetic and magnetoelectric properties can be understood by taking into account the interplay between crystal symmetry and the local symmetry of the Holmium ions.