Universidade Federal do Amazonas

most citedQCD sum rules study of the meson Z^+(4430)

75 citations

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cond-mat.stat-mech2009★ 16 cited

Phase Diagram of the Two-Dimensional Ising Model with Random Competing Interactions

Octavio R. Salmon, J. Ricardo de Sousa, Fernando D. Nobre

An Ising model with ferromagnetic nearest-neighbor interactions $J_{1}$ ( $J_{1} > 0$ ) and random next-nearest-neighbor interactions [ $+ J_{2}$ with probability $p$ and $- J_{2}$ with p…

cond-mat.stat-mech2009★ 21 cited

Magnetization Plateaux in the Antiferromagnetic Ising Chain with Single-Ion Anisotropy

Fabian Litaiff, J. Ricardo de Sousa, N. S. Branco

Two one-dimensional spin-1 antiferromagnetic Ising models with a single-ion anisotropy under external magnetic field at low temperatures are exactly investigated by the transfer-ma…

cond-mat.stat-mech2008

Variational method study of the spin-1 Ising model with biaxial crystal-field anisotropy

J. Ricardo de Sousa, N. S. Branco

The phase diagram of the spin-1 Ising model in the presence of a biaxial crystal-field anisotropy is studied within the framework of a variational approach, based on the Bogolyubov…