Saturation of the anomalous Hall effect at high magnetic fields in altermagnetic RuO2
| Autor: | Tschirner, Teresa, Keßler, Philipp, Betancourt, Ruben Dario Gonzalez, Kotte, Tommy, Kriegner, Dominik, Buechner, Bernd, Dufouleur, Joseph, Kamp, Martin, Jovic, Vedran, Smejkal, Libor, Sinova, Jairo, Claessen, Ralph, Jungwirth, Tomas, Moser, Simon, Reichlova, Helena, Veyrat, Louis |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | APL Mater. 11, 101103 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1063/5.0160335 |
| Popis: | Observations of the anomalous Hall effect in RuO$_2$ and MnTe have demonstrated unconventional time-reversal symmetry breaking in the electronic structure of a recently identified new class of compensated collinear magnets, dubbed altermagnets. While in MnTe the unconventional anomalous Hall signal accompanied by a vanishing magnetization is observable at remanence, the anomalous Hall effect in RuO$_2$ is excluded by symmetry for the N\'eel vector pointing along the zero-field [001] easy-axis. Guided by a symmetry analysis and ab initio calculations, a field-induced reorientation of the N\'eel vector from the easy-axis towards the [110] hard-axis was used to demonstrate the anomalous Hall signal in this altermagnet. We confirm the existence of an anomalous Hall effect in our RuO$_2$ thin-film samples whose set of magnetic and magneto-transport characteristics is consistent with the earlier report. By performing our measurements at extreme magnetic fields up to 68 T, we reach saturation of the anomalous Hall signal at a field $H_{\rm c} \simeq$ 55 T that was inaccessible in earlier studies, but is consistent with the expected N\'eel-vector reorientation field. Comment: 4 figures |
| Databáze: | arXiv |
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