Critical behaviour near critical end points and tricritical points in disordered spin-1 ferromagnets

Critical end points and tricritical are multicritical that separate lines of continuous transitions from first order in the phase diagram many systems. In models like spin-1 disordered Blume–Capel model repulsive Blume–Emery–Griffiths model, point splits into a critical bicritical with an increase disorder coupling strength respectively. to make distinction between these two points, we investigate contrast behaviour boundary co-existence diameter around them.