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MA: Fachverband Magnetismus
MA 46: Spin: Transport, Orbitronics and Hall Effects I
MA 46.12: Vortrag
Donnerstag, 19. März 2020, 12:30–12:45, HSZ 403
Crystal Hall effects from antiferromagnetism — •Libor Šmejkal1,2, Tomáš Jungwirth2,3, and Jairo Sinova1,2 — 1Institut für Physik, Johannes Gutenberg Universität Mainz, D-55099 Mainz, Germany — 2Institute of Physics, Academy of Sciences of the Czech Republic, Cukrovarnická 10, 162 00 Praha 6 Czech Republic — 3School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
Antiferromagnetic order is commonly pictured as magnetization projection arrows at the atomic positions in crystals. Here we show that the symmetry analysis arising from this picture is incomplete, and we need to consider the full ground-state magnetization density. We show that this magnetization density in magnets with low symmetry Wyckoff positions and low magnetic symmetry can generate large spontaneous Hall effect [1]. This mechanism revealed strong Hall conductivity from perfectly compensated collinear antiferromagnetism in a large class of spintronics promising materials previously anticipated to be prohibited from spontaneous Hall effect. We analyse the topological origin of the crystal Hall conductivity contributions in centrosymmetric RuO2 and chiral crystal CoNb3S6. Finally, we will discuss possible experimental discoveries of the effect and impact of the mechanism on other spintronics phenomena[2]. [1] L. Šmejkal, R. González-Hernández, T. Jungwirth, and J. Sinova, arXiv:1901.00445v1 (2019) [2]L. Šmejkal, Y. Mokrousov, B. Yan, and A. H. MacDonald, Nature Physics, 14, 242 (2018)