SKM 2021 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 6: Skyrmions I (joint session MA/KFM)

KFM 6.12: Talk

Wednesday, September 29, 2021, 13:00–13:15, H5

Magnetoelastic coupling and phases in the skyrmion lattice magnet Gd₂PdSi₃ discovered by high-resolution dilatometry — •Sven Spachmann¹, Rüdiger Klingeler¹, Ahmed Elghandour¹, Matthias Frontzek², and Wolfgang Löser³ — ¹Kirchhoff Institute for Physics, Heidelberg University, Germany — ²Oak Ridge National Laboratory, Oak Ridge, USA — ³Leibniz Institute for Solid State and Materials Research (IFW), Dresden, Germany

We report high-resolution capacitance dilatometry measurements on single crystals of the centrosymmetric skyrmion-hosting intermetallic Gd₂PdSi₃ in magnetic fields up to 15 T which are complemented by specific heat and magnetization studies. Our data enable us to complete the magnetic phase diagram and to establish yet unreported phase boundaries. We find strong magnetoelastic effects associated with antiferromagnetic order at T_N1= 22.3 K and T_N2 = 19.7 K as well as an additional feature at T^* ≈ 13 K. Grüneisen analysis shows the onset of magnetic contributions around 60 K, i.e., well above T_N1, and strong field effects in an applied magnetic field of 15 T are found up to 200 K (150 K) for B ∥ c (B ∥ a^*, i.e., B ⊥ c). Our data allow us to extract the uniaxial pressure dependence of the different phase boundaries. We elucidate thermodynamic properties of the recently discovered skyrmion lattice phase and show that it is strongly enhanced by uniaxial pressure.