Anomalies in the multicritical behavior of staggered magnetic and direct magnetic susceptibilities of iron group dihalides

The temperature dependencies of magnetic response functions of the anhydrous dihalides of iron-group elements are examined in the neighborhood of the multicritical points (tricritical point, critical end point, and double critical end point) within molecular field approximation. Our findings reveal the fact that the spin -1/2 metamagnetic Ising system exhibits anomalies in the temperature dependence of the magnetic response functions for r < 0.3. In addition, we extensively investigated how an inter- and intra-layer exchange interaction ratio influence the magnetic response properties of these systems. Finally, a comparison has been made with related works. (C) 2012 Elsevier BY. All rights reserved.