Phase coexistence and relaxation of the spherical frustrated Blume-Emery-Griffiths model with attractive particles couplingA. Caiazzo, A. Coniglio and M. Nicodemi
Dipartimento di Scienze Fisiche, INFM, Unità di Napoli Monte Sant'Angelo, I-80126 Napoli, Italy
(Received 23 September 2003; accepted 18 November 2003)
We study the equilibrium and dynamical properties of a spherical version of the frustrated Blume-Emery-Griffiths model at mean-field level for attractive particle-particle coupling ( K>0). Beyond a second-order transition line from a paramagnetic to a (replica symmetric) spin glass phase, the density-temperature phase diagram is characterized by a tricritical point from which, interestingly, a first-order transition line starts with coexistence of the two phases. In the Langevin dynamics the paramagnetic/spin glass discontinuous transition line is found to be dependent on the initial density; close to this line, on the paramagnetic side, the correlation-response plot displays interrupted aging.
75.10.Nr - Spin-glass and other random models.
05.50.+q - Lattice theory and statistics (Ising, Potts, etc.).
64.60.Ht - Dynamic critical phenomena.
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