Critical behavior of AC antiferromagnetic and ferromagnetic susceptibilities of a spin-12 metamagnetic Ising system

► Staggered dynamic susceptibility diverges as T→TN in the low frequency region. ► Dynamic total susceptibility exhibits a finite jump discontinuity as T→TN while wτ2⪡1. ► The slope of the staggered magnetic dispersion curve chances in sign as T→TN.