AUGMENTED SPACE FORMALISM AND RENORMALIZATION FOR GROUND AND EXCITED-STATES OF MAGNETIC SYSTEMS

Citation
A. Cordelli et al., AUGMENTED SPACE FORMALISM AND RENORMALIZATION FOR GROUND AND EXCITED-STATES OF MAGNETIC SYSTEMS, Zeitschrift fur Physik. B, Condensed matter, 97(4), 1995, pp. 543-547
Citations number
26
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
07223277
Volume
97
Issue
4
Year of publication
1995
Pages
543 - 547
Database
ISI
SICI code
0722-3277(1995)97:4<543:ASFARF>2.0.ZU;2-9
Abstract
The augmented space formalism has been used so far for the study of di sordered crystals. We stress here that the topological structure of th e augmented space of a binary alloy is formally equivalent to the set of configurations of an Ising system. In particular in both cases a ve ry useful binary representation for labelling the vectors of the space can be done. Starting from this observation we have developed a very efficient description of the Ising hamiltonian, and we have shown that it can be succesfully applied both in the direct diagonalization appr oach and in conjunction with the renormalization scheme. Within this l ast case we have proposed a generalization of the techniques commonly used in the literature, obtaining very good results.