Infinite-randomness criticality in a randomly layered Heisenberg magnet

Details Infinite-randomness criticality in a randomly layered Heisenberg magnet Infinite-randomness criticality in a randomly layered Heisenberg magnet

2011-09-19

arxiv.org/abs/1109.4172v3

Phys. Rev. B 84, 184202 (2011)

Physics

Condensed Matter

Statistical Mechanics

8 pages, 8 figures, final version as published

Scientific paper

10.1103/PhysRevB.84.184202

We study the ferromagnetic phase transition in a randomly layered Heisenberg magnet using large-scale Monte-Carlo simulations. Our results provide numerical evidence for the infinite-randomness scenario recently predicted within a {strong-disorder renormalization group approach}. Specifically, we investigate the finite-size scaling behavior of the magnetic susceptibility which is characterized by a non-universal power-law divergence in the Griffiths phase. We also study the perpendicular and parallel spin-wave stiffnesses in the Griffiths phase. In agreement with the theoretical predictions, the parallel stiffness is nonzero for all temperatures $T

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