https://doi.org/10.1140/epjb/e2004-00045-9
Modulated replica symmetry breaking schemes for antiferrimagnetic spin glasses
1
Institute for Theoretical Physics, University
of Würzburg, 97074 Würzburg, Germany
2
Department of Physics, University of Oxford, Keble
Road, Oxford OX1 3NP, UK
Corresponding author: a Oppermann@physik.uni-wuerzburg.de
Received:
5
July
2003
Revised:
11
December
2003
Published online:
15
March
2004
We define modulated replica symmetry breaking (RSB) schemes which combine tree- and wave-like structures. A modulated scheme and unmodulated RSB are evaluated at 1-step level for a semiconductor model with antiferromagnetic Korenblit-Shender interaction. By comparison of the free energies we find evidence that a T=0 phase transition in the ferrimagnetic phase leads to a transition between the different RSB-schemes. An embedding factor of Parisi block matrices with sublattice-asymmetrical size is employed as a new variational parameter in the modulated scheme.
PACS: 68.35.Rh – Phase transitions and critical phenomena / 75.10.Nr – Spin glass and other random models
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004
