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This is simplest of the models which can be used to predict paramagnetic-ferromagnetic transform. Over there two dimention dipol translation symmetric N-nodes lattice is considered by percalation theory, what gives statistical summ in form
Z=pow(2/(1-x*x,N)P{sqrt(pow(1+x*x,2)-2x*(1-x*x)[cos(2п*i/L)+cos(2п*j/L)])}, where L-the number of rib nodes and x=th(J/kT), J-interaction parameter. P-multiplicating over indices i and j
_Gosha_ (22)
This is simplest of the models which can be used to predict paramagnetic-ferromagnetic transform. Over there two dimention dipol translation symmetric N-nodes lattice is considered by percalation theory, what gives statistical summ in form
Z=pow(2/(1-x*x,N)P{sqrt(pow(1+x*x,2)-2x*(1-x*x)[cos(2п*i/L)+cos(2п*j/L)])}, where L-the number of rib nodes and x=th(J/kT), J-interaction parameter. P-multiplicating over indices i and j