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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…
cond-mat.stat-mech2004
Effects of anisotropy on a quantum Heisenberg spin glass in a three-dimensional hierarchical lattice
J. Ricardo de Sousa, Beatriz Boechat, Claudette Cordeiro +1
We study the anisotropic Heisenberg spin-glass model in a three-dimensional hierarchical lattice (designed to approximate the cubic lattice), within a real-space renormalization-gr…