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

Abstract

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.

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

References in corpus (2)

• Thermodynamical Properties of a Spin 1/2 Heisenberg Chain Coupled to Phonons
• Temperature Dependence of Spin and Bond Ordering in a Spin-Peierls System

Cited by in corpus (4)

• Magneto-elastic instability in Molecular Antiferromagnetic Rings
• Ground state fidelity in bond-alternative Ising chains with Dzyaloshinskii-Moriya interactions
• Exploring magneto-electric coupling through lattice distortions: insights from a pantograph model
• Structural transition, spontaneous formation of strong singlet dimers and metamagnetism in $S=3/2$ magnetoelastic spin chains