Replica symmetry breaking solution for two-sublattice fermionic Ising spin glass models in a transverse field

The one-step replica symmetry breaking is used to study the competition between spin glass (SG) and antiferromagnetic order (AF) in two-sublattice fermionic Ising SG models in the presence of a transverse Γ and a parallel H magnetic fields. Inter- and intra-sublattice exchange interactions following...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007-03, Vol.310 (2), p.1508-1510
Main Authors: Zimmer, F.M., Magalhaes, S.G.
Format: Article
Language:English
Subjects:
Antiferromagnetism
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
Quantum spin glass
Replica symmetry breaking solution
Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies, synchrotron-source x-ray scattering, etc.)
Transverse field
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Summary:The one-step replica symmetry breaking is used to study the competition between spin glass (SG) and antiferromagnetic order (AF) in two-sublattice fermionic Ising SG models in the presence of a transverse Γ and a parallel H magnetic fields. Inter- and intra-sublattice exchange interactions following Gaussian distributions are considered. The problem is formulated in a Grassmann path integral formalism within the static ansatz. Results show that H favors the non-ergodic mixed phase (AF+SG) and it destroys the AF. The Γ suppresses the magnetic orders, and the intra-sublattice interaction can introduce a discontinuous phase transition.
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.10.652