3D Critical behavior in Antiferromagnetic Van der Waals CrSBr

We systematically investigate the anisotropic magnetic and magnetocaloric properties in single-crystal CrSBr, a layered van der Waals antiferromagnet. Single crystals of CrSBr are synthesized by Chemical Vapor Transport (CVT) method, and their crystallographic orientations are determined by Laue diffraction. Magnetic entropy change is estimated from isothermal magnetization measurements, revealing a significant shift in the peak of the magnetic entropy change from 132 K at 0.1 T to 170 K at 9 T across all three crystallographic directions. This may indicate a strong intralayer ferromagnetic ordering well above the bulk Neel temperature with an increasing magnetic field—an uncommon feature among similar layered materials. Critical exponents are estimated by analyzing the relative cooling power and the full width at half maximum of the magnetic entropy change along all the 3-axes. Critical exponent values suggest that magnetic phase transition in CrSBr can be classified as 3D critical behavior.