Abstract
The thermodynamics of finite open antiferromagneticXXZ chains is studied using field theory, Bethe ansatz and quantum Monte Carlo methods. Forthe susceptibility a parameter-free result as a function of the number of sitesL andtemperature T beyond the scaling limit is derived. The limiting cases (J being the exchange constant), where the boundary correction shows a logarithmicallysuppressed Curie behaviour, and , where a crossover to the ground state behaviour takes place, are discussed in detail. Onthe basis of this analysis we present a simple formula for the averaged susceptibility of aspin-1/2 chain doped with non-magnetic impurities. We show that the effective Curie constant has ahighly non-trivial temperature dependence and shows scaling in the low temperature limit. Finally,corrections due to intrachain and interchain couplings and implications for experiments onSr2Cu1−xPdxO3+δ and related compounds are discussed.
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