Phys. Rev. B 58, 9248–9251 (1998)Specific heat of defects in the Haldane system Y2BaNiO5Received 12 June 1998; published in the issue dated 1 October 1998 We calculate the specific heat C(B,T) of the antiferromagnetic spin-1 chain compound Y2BaNi1-xZnxO5 as a function of magnetic field B and temperature T. The low-energy spectrum of an anisotropic Heisenberg Hamiltonian has been solved using the density-matrix renormalization-group theory. 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) we find asymptotically free S=1/2 states. Our results are thus also consistent with electron-spin-resonance data for NENP. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.9248
DOI:
10.1103/PhysRevB.58.9248
PACS:
75.40.Cx, 75.10.Jm, 75.40.Mg
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