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arXiv · 2405.18026

SP-STM study of the multi-Q phases in GdRu2Si2

Jonas Spethmann·Nguyen Duy Khanh·Haruto Yoshimochi·Rina Takagi·Satoru Hayami·Yukitoshi Motome·Roland Wiesendanger·Shinichiro Seki·Kirsten von Bergmann
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Abstract

The two stable surfaces of GdRu2Si2 are studied using spin-polarized scanning tunneling microscopy (SP-STM). Depending on the applied magnetic field different magnetic phases have been found and the presented measurements are in agreement with the respective previously proposed multi-Q spin textures. In particular the multi-Q nature of the zero magnetic field state, for which previous experiments could not rule out the coexistence of single-Q states, can be confirmed by our spin-resolved measurements on the Si-terminated surface. The surfaces of GdRu2Si2 exhibit strong magnetism-induced modulations of the spin-averaged density of states. We find that while the magnetic contribution to the tunnel signal can be clearly identified for the Si-terminated surface this proves to be much more difficult for the Gd-terminated surface. However, the magnetic field dependent spatial modulations on the Gd-terminated surface demonstrate that additional magnetic phase transitions occur for the surface layer compared to those identified for bulk GdRu2Si2 and possible spin textures are presented.

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Jonas Spethmann, Nguyen Duy Khanh, Haruto Yoshimochi, Rina Takagi, Satoru Hayami, Yukitoshi Motome, Roland Wiesendanger, Shinichiro Seki, Kirsten von Bergmann. 2024-05-28. SP-STM study of the multi-Q phases in GdRu2Si2. https://doi.org/10.1103/physrevmaterials.8.064404

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