Field-orientation-dependent magnetic phases in GdRu$_2$Si$_2$ probed with muon-spin spectroscopy

• DOI: 10.48550/arxiv.2403.09431
• Publication Date: 2024-03-14
• Authors: B. M. Huddart; A. Hernández-Melían; G. D. A. Wood; D. A. Mayoh; M. Gomilšek; Zurab Guguchia; Chennan Wang; Stephen J. Blundell; G. Balakrishnan; Tom Lancaster
• Keywords: Muon spin spectroscopy

Centrosymmetric GdRu$_2$Si$_2$ exhibits a variety of multi-Q magnetic states as function temperature and applied field, including square skyrmion-lattice phase. The material's behavior is strongly dependent on the direction with different phase diagrams resulting for fields parallel or perpendicular to crystallographic $c$ axis. Here, we present results muon-spin relaxation ($\mu^+$SR) measurements single crystals GdRu$_2$Si$_2$. Our analysis based computation muon stopping sites consideration zero-point motion effects, allowing direct comparison underlying spin textures in material. Using transverse-field $\mu^+$SR along either [001] [100] directions, distinguish between phases this system via their distinct response, providing additional evidence skyrmion meron-lattice phases, while also suggesting existence RKKY-driven hyperfine coupling. Zero-field provides clear transition two magnetically-ordered at 39 K.