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Title

Equilibrium spin-glass transition of magnetic dipoles with random anisotropy axes on a site-diluted lattice

AuthorsFernández, Julio F. CSIC; Alonso, Juan J.
Issue DateJun-2009
PublisherAmerican Physical Society
CitationPhysical Review Letters 79(21): 214424.1-214424.6 (2009)
AbstractWe 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 Tc, given by kBTc=(0.95±0.1)xεd, where εd 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) δ|q|≃0.5(|q|)√T/x, independently of N, where δ|q| is the root-mean-square deviation of |q|.
Description6 pages, 7 figures, 1 table.-- PACS number s : 75.10.Nr, 75.10.Hk, 75.40.Mg
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.79.214424
URIhttp://hdl.handle.net/10261/20298
DOI10.1103/PhysRevB.79.214424
ISSN0031-9007
Appears in Collections:(ICMA) Artículos




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