Random Fixed Point of Three-Dimensional Random-Bond Ising Models

Details Random Fixed Point of Three-Dimensional Random-Bond Ising Models Random Fixed Point of Three-Dimensional Random-Bond Ising Models

2000-02-07

arxiv.org/abs/cond-mat/0002089v1

J. Phys. Soc. Jpn. 69, 631 (2000)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 5 figures, to be published in Journal of the Physical Society of Japan

Scientific paper

10.1143/JPSJ.69.631

The fixed-point structure of three-dimensional bond-disordered Ising models is investigated using the numerical domain-wall renormalization-group method. It is found that, in the +/-J Ising model, there exists a non-trivial fixed point along the phase boundary between the paramagnetic and ferromagnetic phases. The fixed-point Hamiltonian of the +/-J model numerically coincides with that of the unfrustrated random Ising models, strongly suggesting that both belong to the same universality class. Another fixed point corresponding to the multicritical point is also found in the +/-J model. Critical properties associated with the fixed point are qualitatively consistent with theoretical predictions.

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