Spin-Peierls transition of the first order in S=1 antiferromagnetic Heisenberg chains

Details Spin-Peierls transition of the first order in S=1 antiferromagnetic Heisenberg chains Spin-Peierls transition of the first order in S=1 antiferromagnetic Heisenberg chains

2000-12-20

arxiv.org/abs/cond-mat/0012377v2

Phys. Rev. B 64 (2001) 014405

Physics

Condensed Matter

Statistical Mechanics

7 pages, 12 eps figures embedded in the text; corrected typos, replaced figures

Scientific paper

10.1103/PhysRevB.64.014405

We investigate a one-dimensional S=1 antiferromagnetic Heisenberg model coupled to a lattice distortion by a quantum Monte Carlo method. Investigating the ground state energy of the static bond-alternating chain, we find that the instability to a dimerized chain depends on the value of the spin-phonon coupling, unlike the case of S=1/2. The spin state is the dimer state or the uniform Haldane state depending on whether the lattice distorts or not, respectively. At an intermediate value of the spin-phonon coupling, we find the first-order transition between the two states. We also find the coexistence of the two states.

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