Giant topological Hall effect in correlated oxide thin films
By L. Vistoli, Wen Wang, A. Sander, Qiuxiang Zhu, B. Casals, R. Cichelero, A. Barthélémy, Stephane Fusil, G. Herranz, S. Valencia and 8 more. Nature Physics, 2018
149 citations recorded by the source corpus.
Strong electronic correlations can produce remarkable phenomena such as metal–insulator transitions and greatly enhance superconductivity, thermoelectricity or optical nonlinearity. In correlated systems, spatially varying charge textures also amplify magnetoelectric effects or electroresistance in mesostructures. However, how spatially varying spin textures may influence electron transport in the presence of correlations remains unclear. Here we demonstrate a very large topological Hall effect (THE) in thin films of a lightly electron-doped charge-transfer insulator, (Ca,Ce)MnO3. Magnetic force microscopy reveals the presence of magnetic bubbles, whose density as a function of magnetic field peaks near the THE maximum. The THE critically depends on carrier concentration and diverges at low doping, near the metal–insulator transition. We discuss the strong amplification of the THE by correlation effects and give perspectives for its non-volatile control by electric fields.A strong Hall effect is observed in a material with spin textures and strong electron correlations. This hints that correlation effects can amplify real-space topological spin transport.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/eeef69f93f2dda031dfea6cfd7ce4bb5ee8449d8
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Citations in the corpus
- Oxide spin-orbitronics: spin–charge interconversion and topological spin textures (2021, background): “Panel a adapted from reF.(177), Springer Nature Limited.”
- Topological transition from nodal to nodeless Zeeman splitting in altermagnets (2023, background): “The main difference with respect to the G a C b A c state is that only the former displays an anomalous Hall effect, which is observed experimentally in doped CaMnO 3 [44] and is related to the fact that the symmetries of that AM configuration allow for a non-zero macroscopic magnetization [45].”