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MA: Fachverband Magnetismus
MA 30: Functional Antiferromagnetism
MA 30.4: Vortrag
Mittwoch, 11. März 2026, 10:15–10:30, POT/0151
Magnetic-phase-entangled orbital anisotropy in the van der Waals antiferromagnet CrPS4 revealed by resonant inelastic X-ray scattering — •Zhijia Zhang1, Yuan Wei1, Carlos William Galdino1, Cedomir Petrovic2, and Thorsten Schmitt1 — 1Centre for Photon Science, Paul Scherrer Institut, Villigen PSI 5225, Switzerland — 2Shanghai Advanced Research in Physical Sciences, Shanghai 201203, P.R. China
The emergence of exfoliable magnetic van der Waals (vdW) materials with weak inter-layer correlations enables physicists to study magnetism directly in two dimensions (2D). Their sustained magnetic order and other novel magnetic properties down to the 2D limit make them promising candidates for spintronic applications. CrPS4 is an A-type antiferromagnetic vdW material with strong correlations between spin, orbital, and structural degrees of freedom, and its highly unusual magnetic properties has been the subject of considerable scientific and practical interests. In this talk, I will present our temperature-dependent X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS) measurements on bulk CrPS4 crystals. Both the XAS and RIXS spectra display significant linear dichroism. In particular, the linear-dichroic RIXS intensity of one of the orbital excitations shows an order-parameter-like temperature dependence below the Néel temperature; and the dichroism entirely disappears in the paramagnetic phase. This evidence strongly supports the role of the orbital anisotropy as the shaping agent of the magnetic states in CrPS4.
Keywords: Magnetic van der Waals material; Magnetic anisotropy; Antiferromagnetic phase transition; Resonant inelastic X-ray scattering; X-ray absorption spectroscopy