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Ginzburg-Landau theory of the cluster glass phase

Th. M. Nieuwenhuizen, C. N. A. van Duin

cond-mat.dis-nnarXiv:cond-mat/9611233

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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