Inflection Point as a Manifestation of Tricritical Point on the Dynamic Phase Boundary in Ising Meanfield Dynamics  

作　　者：Muktish Acharyya Ajanta Bhowal Acharyya 

机构地区：[1]Department of Physics,Presidency College,86/1 College Street,Calcutta-700073,India [2]Department of Physics,Hooghly Mohsin College,PO-Chinsurah,Dist-Hooghly,India.

出　　处：《Communications in Computational Physics》2008年第2期397-405,共9页计算物理通讯（英文）

摘　　要：We studied the dynamical phase transition in kinetic Ising ferromagnetsdriven by oscillating magnetic field in meanfield approximation. The meanfield differentialequation was solved by sixth order Runge-Kutta-Felberg method. We calculatedthe transition temperature as a function of amplitude and frequency of oscillatingfield. This was plotted against field amplitude taking frequency as a parameter.As frequency increases the phase boundary is observed to become inflated. The phaseboundary shows an inflection point which separates the nature of the transition. Onthe dynamic phase boundary a tricritical point (TCP) was found, which separates thenature (continuous/discontinuous) of the dynamic transition across the phase boundary.The inflection point is identified as the TCP and hence a simpler method of determiningthe position of TCP was found. TCP was observed to shift towards high fieldfor higher frequency. As frequency decreases the dynamic phase boundary is observeto shrink. In the zero frequency limit this boundary shows a tendency to merge to thetemperature variation of the coercive field.

关 键 词：Ising model meanfield theory dynamic transition tricritical point. 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]