Ginzburg-Landau theory of the cluster glass phase
Th. M. Nieuwenhuizen, C. N. A. van Duin
Abstract
On the basis of a recent field theory for site-disordered spin glasses a Ginzburg-Landau free energy is proposed to describe the low temperatures glassy phase(s) of site-disordered magnets. The prefactors of the cubic and dominant quartic terms change gradually along the transition line in the concentration-temperature phase diagram. Either of them may vanish at certain points (c*, T*), where new transition lines originate. The new phases are classified
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