Berlin 2024 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Spin Structures and Magnetic Phase Transitions I
MA 5.12: Vortrag
Montag, 18. März 2024, 12:30–12:45, EB 202
The role of magnetoelastic coupling in GdRu2Si2 and uniaxial pressure effects on the skyrmion-lattice phase — •Lukas Gries1, Daniel Mayoh2, George Wood2, Geetha Balakrishnan2, and Rüdiger Klingeler1 — 1Kirchhoff Institute for Physics, Heidelberg University, Germany — 2Department of Physics, University of Warwick, United Kingdom
The centrosymmetric tetragonal antiferromagnet GdRu2Si2 displays a rich phase diagram including the square magnetic skyrmion lattice phase. Here, we present high-resolution capacitance dilatometry and magnetisation studies on single crystals in external magnetic fields up to 15 T. Our data show significant magneto-elastic coupling as proven by pronounced anomalies in thermal expansion and magnetostriction at the phase boundaries. The clear signatures of the phase boundaries allow us to discover new phases, thereby expanding and complementing the magnetic phase diagram. We qualitatively and quantitatively determine the uniaxial pressure dependencies of the phase boundaries. In particular the skyrmion-lattice phase is enlarged and stabilised in field and temperature by uniaxial pressure applied along the crystallographic c axis.
Keywords: GdRu$_2$Si$_2$; Thermal Expansion; Dilatometry; Skyrmion; Magnetoelastic Coupling