Specific Heat of defects in the Haldane System Y_2BaNiO_5

Details Specific Heat of defects in the Haldane System Y_2BaNiO_5 Specific Heat of defects in the Haldane System Y_2BaNiO_5

1997-09-09

arxiv.org/abs/cond-mat/9709111v1

Phys. Rev. B 58, 9248 (1998)

Physics

Condensed Matter

4 pages, 4 figures, Latex file

Scientific paper

10.1103/PhysRevB.58.9248

We calculate the specific heat of the antiferromagnetic spin-1 chain compound Y_2BaNi_{1-x}Zn_xO_5 in the presence of a magnetic field. The low-energy spectrum of a Heisenberg Hamiltonian, which includes realistic anisotropies, has been solved using the density matrix renormalization group. The observed Schottky anomaly is very well described by this theory. 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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