Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2009-03-03
Phys. Rev. B v79, p214424 (2009)
Physics
Condensed Matter
Statistical Mechanics
7 LaTeX pages, 7 eps figures. Submitted to PRB on 30 December 2008
Scientific paper
10.1103/PhysRevB.79.214424
We study partially occupied lattice systems of classical magnetic dipoles which point along randomly oriented axes. Only dipolar interactions are taken into account. The aim of the model is to mimic collective effects in disordered assemblies of magnetic nanoparticles. From tempered Monte Carlo simulations, we obtain the following equilibrium results. The zero temperature entropy approximately vanishes. Below a temperature T_c, given by k_B T_c= (0.95 +- 0.1)x e_d, where e_d is a nearest neighbor dipole-dipole interaction energy and x is the site occupancy rate, we find a spin glass phase. In it, (1) the mean value <|q|>, where q is the spin overlap, decreases algebraically with system size N as N increases, and (2) D|q| = 0.5 <|q|> (T/x)^1/2, independently of N, where D|q| is the root mean square deviation of |q|.
Alonso Juan J.
Fernandez Julio F.
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