Dresden 2020 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 4: Multiferroics (joint session KFM/MA)

KFM 4.4: Vortrag

Montag, 16. März 2020, 16:00–16:20, HSZ 105

Magnetic Structure and Magnetoelectricity in Holmium-Doped Langasite — •Lukas Weymann1, Thomas Kain1, Lorenz Bergen1, Alexey Shuvaev1, Evan Constable1, David Szaller1, Artem M. Kuzmenko2, Alexander A. Mukhin2, Vsevolod Yu. Ivanov2, Nadezhda V. Kostyuchenko1,3, Maxim Mostovoy4, and Andrei Pimenov11Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria — 2Prokhorov General Physics Institute of Russian Academy of Sciences, Moscow, Russia — 3Moscow Institute of Physics and Technology, Dolgoprudny, Moscow region, Russia — 4Theory of Condensed Matter, Zernike Institute for Advanced Materials, Groningen, The Netherlands

The compounds of the rare-earth langasite family R3Ga5SiO14 were investigated for their striking electromechanical properties in the early 1980s and attracted new scientific attention due to their intriguing magnetic and magnetoelectric properties in the past decade. In this work we present the results of a magnetoelectric effect, i.e. electric polarization induced by an external magnetic field, in the diluted holmium langasite.

This effect has an unusual angular dependence, which can be explained by taking into account the three-fold symmetry of the crystal and its rather complex magnetic structure. The latter was investigated by measurements in a Vibrating Sample Magnetometer and a torque magnetometer. Magnetic and magnetoelectric results can be understood taking into account the interplay between crystal symmetry and the local symmetry of the Holmium ions.

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