Authors: Rainer W. Kühne
We present a quantum Monte Carlo study for the isotropic antiferromagnetic Heisenberg chain coupled to Einstein phonons. By investigating the behavior of the correlation length we find the critical exponent to depend on both the phonon frequency and the spin-phonon coupling constant. Hence, these systems change the universality class continuously with the spin-phonon coupling.
Comments: 4 Pages. This preprint was accepted for publication by Physicsal Review B. The author was forced by Prof. Klaus Fabricius to withdraw the paper from both Physical Review B and the arXiv preprint server. The author is still thinking that the paper is correct.
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