Quenched-Vacancy Induced Spin-Glass Order

Details Quenched-Vacancy Induced Spin-Glass Order Quenched-Vacancy Induced Spin-Glass Order

2008-10-31

arxiv.org/abs/0811.0025v2

Phys. Rev. E 79, 021110 (2009)

Physics

Condensed Matter

Disordered Systems and Neural Networks

Added data, references. 4 pages, 4 figures. Published version

Scientific paper

10.1103/PhysRevE.79.021110

The ferromagnetic phase of an Ising model in d=3, with any amount of quenched antiferromagnetic bond randomness, is shown to undergo a transition to a spin-glass phase under sufficient quenched bond dilution. This general result, demonstrated here with the numerically exact renormalization-group solution of a d=3 hierarchical lattice, is expected to hold true generally, for the cubic lattice and for quenched site dilution. Conversely, in the ferromagnetic-spinglass-antiferromagnetic phase diagram, the spin-glass phase expands under quenched dilution at the expense of the ferromagnetic and antiferromagnetic phases. In the ferro-spinglass phase transition induced by quenched dilution reentrance is seen, as previously found for the ferro-spinglass transition induced by increasing the antiferromagnetic bond concentration.

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