Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2011-07-15
Phys. Rev. B 84 (2011) 134202
Physics
Condensed Matter
Disordered Systems and Neural Networks
24 pages
Scientific paper
We investigate the ferromagnetic-glassy transitions which separate the low-temperature ferromagnetic and spin-glass phases in the temperature-disorder phase diagram of three-dimensional Ising spin-glass models. For this purpose, we consider the cubic-lattice +-J (Edwards-Anderson) Ising model with bond distribution $P(J) = p \delta(J - 1) + (1-p) \delta(J + 1)$, and present a numerical Monte Carlo study of the critical behavior along the line that marks the onset of ferromagnetism. The finite-size scaling analysis of the Monte Carlo data shows that the ferromagnetic-glassy transition line is slightly reentrant. As a consequence, for an interval of the disorder parameter p, around p=0.77, the system presents a low-temperature glassy phase, an intermediate ferromagnetic phase, and a high-temperature paramagnetic phase. Along the ferromagnetic-glassy transition line magnetic correlations show a universal critical behavior with critical exponents nu=0.96(2) and eta=-0.39(2). The hyperscaling relation beta/nu = (1 + eta)/2 is satisfied at the transitions, so that beta/nu = 0.305(10). This magnetic critical behavior represents a new universality class for ferromagnetic transitions in Ising-like disordered systems. Overlap correlations are apparently not critical and show a smooth behavior across the transition.
Ceccarelli Giacomo
Pelissetto Andrea
Vicari Ettore
No associations
LandOfFree
Ferromagnetic-glassy transitions in three-dimensional Ising spin glasses does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ferromagnetic-glassy transitions in three-dimensional Ising spin glasses, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ferromagnetic-glassy transitions in three-dimensional Ising spin glasses will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-226015