One-dimensional Heisenberg antiferromagnet in which two S=1/2 and two S=1 spins are arranged alternatively

Details One-dimensional Heisenberg antiferromagnet in which two S=1/2 and two S=1 spins are arranged alternatively One-dimensional Heisenberg antiferromagnet in which two S=1/2 and two S=1 spins are arranged alternatively

1997-12-26

arxiv.org/abs/cond-mat/9712298v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages; 3 JPG figures; plain TEX; to be published in J. Magn. Magn. Mater. (Proc. Int. Conf. Magnetism, Cairns, 1997)

Scientific paper

Ground-state and thermodynamic properties of the one-dimensional Heisenberg
antiferromagnet in which two S=1/2 and two S=1 spins are arranged alternatively
are studied by a quantum Monte Carlo method and by analytical estimates. It is
found that the ground state of the system undergoes a second-order phase
transition which accompanies the vanishing of the energy gap.

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