Numerical Study of Competing Spin-Glass and Ferromagnetic Order

Details Numerical Study of Competing Spin-Glass and Ferromagnetic Order Numerical Study of Competing Spin-Glass and Ferromagnetic Order

1996-09-22

arxiv.org/abs/cond-mat/9609213v3

Phys. Rev. B, 55 (1997) 11405.

Physics

Condensed Matter

a bit more data is taken, 5 pages, 4 eps figures included, to appear in PRB

Scientific paper

10.1103/PhysRevB.55.11405

Two and three dimensional random Ising models with a Gaussian distribution of couplings with variance $J$ and non-vanishing mean value $J_0$ are studied using the zero-temperature domain-wall renormalization group (DWRG). The DWRG trajectories in the ($J_0,J$) plane after rescaling can be collapsed on two curves: one for $J_0/J > r_c$ and other for $J_0/J < r_c$. In the first case the DWRG flows are toward the ferromagnetic fixed point both in two and three dimensions while in the second case flows are towards a paramagnetic fixed point and spin-glass fixed point in two and three dimensions respectively. No evidence for an extra phase is found.

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