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Abstract
We analyze by means of the real-space renormalization group (RG) as well as by exact diagonalizations the properties of a single-chain model of a doped spin-Peierls system, where a major role is played by the localized moments created by the impurities. By the RG flow, we are able to follow the behavior of the disordered system for all temperatures below the spin-Peierls transition temperature. In particular, we find an enhancement of magnetic correlations due to disorder, coexisting with an underlying dimerization, in an intermediate temperature range below the spin-Peierls critical temperature and above the coherence temperature of a regular array built by those localized moments. The possible relevance of these results to the doped inorganic spin-Peierls compound ${\mathrm{CuGeO}}_{3}$ is discussed.
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