Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2010-07-30
Phys. Rev. B 83, 014107 (2011)
Physics
Condensed Matter
Disordered Systems and Neural Networks
18 pages, 24 figures, 7 tables
Scientific paper
We present a numerical study of the Blume-Capel model with quenched disorder in 3D. The phase diagram is characterized by spin-glass/paramagnet phase transitions of both first and second order in the thermodynamic sense. Numerical simulations are performed using the Exchange-Monte Carlo algorithm, providing clear evidence for inverse freezing. The main features at criticality and in the phase coexistence region are investigated. The whole inverse freezing transition appears to be first order. The second order transition appears to be in the same universality class of the Edwards-Anderson model. The nature of the spin-glass phase is analyzed by means of the finite size scaling behavior of the overlap distribution functions and the four-spins real-space correlation functions. Evidence for a replica symmetry breaking-like organization of states is provided.
Crisanti Andrea
Leuzzi Luca
Paoluzzi Matteo
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