Browsing IMEF - Artigos publicados em periódicos by Author "Santos, Onofre Rojas"

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  • Santos, Onofre Rojas; Salvador, Juan Segundo Valverde; Souza, Sergio Martins de (2009)
    The paper discusses the transformation of decorated Ising models into an effective undecorated spin model, using the most general Hamiltonian for interacting Ising models including a long range and high order interactions. ...
  • Salvador, Juan Segundo Valverde; Santos, Onofre Rojas; Souza, Sergio Martins de (2008)
    Geometrically frustrated spin models with competing interaction parameters and the phase diagram of their corresponding T = 0 ground state energies are studied. The partition function defined by means of the transfer ...
  • Salvador, Juan Segundo Valverde; Santos, Onofre Rojas; Souza, Sergio Martins de (2008)
    The asymmetric tetrahedron is composed of all edges of a tetrahedron represented by Ising interactions except for one, which has a Heisenberg-type interaction. This asymmetric tetrahedron is arranged by connecting a vertex ...
  • Valverde, Juan Segundo; Souza, Sergio Martins de; Santos, Onofre Rojas (2009)
    We study a two-dimensional XXZ-Ising model on a square-hexagon denoted for simplicity by 4–6 lattice with spin 1/2. The phase diagram at zero temperature is discussed, where five states are found, two types of ferrimagnetic ...

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