Abstract
The specific heat of the antiferromagnetic spin-1 chain compound Y 2BaNi 1− x Zn x O 5 in the presence of a magnetic field is calculated. Solving the low-energy spectrum of an anisotropic Heisenberg Hamiltonian with DMRG and considering the experimental values for the parameters and an approximate model for interchain interactions, the observed C( B, T) is quantitatively reproduced. For large chains ( N>50), contrary to previous interpretations of the specific heat data we find S=1/2 states. These results are thus also consistent with electron-spin-resonance data for NENP.
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