Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1997-01-21
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 included figures
Scientific paper
10.1103/PhysRevLett.78.3382
A model of disordered spin-Peierls system is considered, where domain walls are randomly distributed as a telegraph noise. For this realization of the disorder in an XX spin chain, we calculate exactly the density of states as well as several thermodynamic quantities. The resulting physical behavior should be qualitatively unchanged even for an XXZ chain, up to the isotropic XXX point. For weak disorder, besides a high energy regime where the behavior of a pure spin-Peierls system is recovered, there is a cross-over to a low energy regime with singular thermodynamic properties and enhanced antiferromagnetic fluctuations. These regimes are analyzed with the help of exact results, and the relevant energy scales determined. We discuss the possible relevance of such a disorder realization to the doped inorganic spin-Peierls compound CuGeO$_3$.
Fabrizio Mauro
Mélin Régis
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