Europhys. Lett.
Volume 65, Number 2, January 2004
Page(s) 256 - 261
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 January 2004
Europhys. Lett., 65 (2) , pp. 256-261 (2004)
DOI: 10.1209/epl/i2003-10080-8

Phase coexistence and relaxation of the spherical frustrated Blume-Emery-Griffiths model with attractive particles coupling

A. 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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