A novel intermediate phase in S=2 antiferromagnetic chains with uniaxial anisotropy

Details A novel intermediate phase in S=2 antiferromagnetic chains with uniaxial anisotropy A novel intermediate phase in S=2 antiferromagnetic chains with uniaxial anisotropy

1995-07-24

arxiv.org/abs/cond-mat/9507098v2

Physics

Condensed Matter

9 pages in REVTEX 3.0, including 5 figures in uuencoded compressed PostScript files

Scientific paper

We study ground state properties of the $S=2$ quantum antiferromagnetic chain with a uniaxially anisotropic Hamiltonian: $ H = \sum_{j} [S_{j} \cdot S_{j+1} + D (S^{z}_{j})^2 ] $ by a Monte Carlo calculation. While it has been reported that a string order parameter vanishes exponentially at the isotropic Heisenberg point ($D=0$), we found it tends to remain finite in the thermodynamic limit around $D=1.2$. This implies that the model for $S=2$ has a novel intermediate phase between the Haldane phase and the large-$D$ phase, as was anticipated from the earlier argument based on the Valence-Bond-Solid picture.

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