Giant topological Hall effect in correlated oxide thin films

20 Sep 2019  ·  Vistoli Lorenzo, Wang Wenbo, Sander Anke, Zhu Qiuxiang, Casals Blai, Cichelero Rafael, Barthélémy Agnès, Fusil Stéphane, Herranz Gervasi, Valencia Sergio, Abrudan Radu, Weschke Eugen, Nakazawa Kazuki, Kohno Hiroshi, Santamaria Jacobo, Wu Weida, Garcia Vincent, Bibes Manuel ·

Strong electronic correlations can produce remarkable phenomena such as metal-insulator transitions and greatly enhance superconductivity, thermoelectricity, or optical non-linearity. 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 vs. magnetic field peaks near the THE maximum, as is expected to occur in skyrmion systems. 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. read more

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Materials Science Mesoscale and Nanoscale Physics Applied Physics