SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: Other Materials
TT 10.9: Vortrag
Montag, 27. März 2023, 17:15–17:30, HSZ 204
Magnetic anisotropy and low-energy spin dynamics in magnetic van der Waals compounds Mn2P2S6 and MnNiP2S6 — •Joyal John Abraham1, 2, Yurii Senyk1, Yuliia Shemerliuk1, Sebastian Selter1, Saicharan Aswartham1, Bernd Büchner1, 3, Vladislav Kataev1, and Alexey Alfonsov1 — 1Leibniz IFW Dresden, D-01069 — 2Institute for Solid State and Materials Physics, TU Dresden, D-01069 — 3Institute for Solid State and Materials Physics and Würzburg-Dresden Cluster of Excellence ct.qmat, TU Dresden, D-01062
We report a comprehesive high-field electron spin resonance (ESR) study performed on single crystals of Mn2P2S6 and MnNiP2S6 in the broad ranges of temperatures, frequencies and magnetic fields. Analysing the antiferromagnetic modes well below the ordering temperature TN, we have found that the ground state, the order type and magnetic anisotropy (MA) change with increasing x in (Mn1 − x Nix)2P2S6. In the case of Mn2P2S6, an application of the linear spin wave theory enabled us to determine the anisotropy and exchange constants, important for a quantitative description of the ground state. A systematic increase of the g-factor and its anisotropy, measured at T >>TN, is observed with increasing Ni content, which, in turn, sheds light on the nature of MA in the ordered state. The investigation of the T-dependence of line shifts from the paramagnetic resonance position reveals already well above TN the presence of the short range spin-spin correlations static on ESR time scale, which are more pronounced in MnNiP2S6.