Phase diagram of doped spin-Peierls systems

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Abstract
The phase diagram of a model describing doped CuGeO$_3$ is derived. The model emphasizes the role of the free local moments released by the impurities and randomly distributed inside the gaped singlet background. The low doping phase diagram is in a qualitative agreement with experiments. In particular, a transition to a highly inhomogeneous N\'eel phase is obtained for arbitrary small doping, and, even above the N\'eel temperature, the magnetic correlation length is predicted to greatly exceed the spin-Peierls correlation length.

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