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|
Phase coexistence and relaxation of the spherical frustrated Blume-Emery-Griffiths model with attractive particles coupling
Dipartimento di Scienze Fisiche, INFM, Unità di Napoli Monte Sant'Angelo, I-80126 Napoli, Italy
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 (). 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.
PACS: 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
© EDP Sciences, 2004
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