Berlin 2024 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: Correlated Electrons: Other Materials
TT 27.9: Vortrag
Dienstag, 19. März 2024, 11:45–12:00, H 3010
Field-driven tuning of magnetic excitations in the van der Waals compound CuCrP2S6 (CCPS) — •Joyal John Abraham1, 2, Sebastian Selter1, Yuliia Shemerliuk1, 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
High-frequency ESR was performed on a single crystal of CCPS. The magnetic Cr 3+ ions forming ferromagnetic layers are diluted with non-magnetic Cu 1+ ions which makes it interesting compared to other members in the metal-P2S6 family. The adjacent layers are coupled antiferomagnetically. We have found that at 300 K, CCPS behaves as a paramagnet with almost spin-only g-factors showing a small anisotropy. Below T≈ 200-250 K, the ESR line shifts from the paramagnetic position indicating the presence of a broad range of short-range spin-spin correlations. In the ordered state below TN = 30 K, we observed two excitation gaps and a spin flop at 0.43 T. Remarkably, at stronger magnetic fields a crossover from the antiferromagnetic (AFM) resonance modes to the FM modes, unexpected for a canonical antiferromagnet takes place. Application of the linear spin wave theory enabled us to quantify the exchange (A) and anisotropic constants. The value of A is found to be comparable to the value of the easy-plane uniaxial anisotropy, which explains such an unusual AFM-FM crossover.
Keywords: Electron Spin Resonance; van der Waals materials; Magnetic anisotropy; Spin correlation; 2D Magnetism