An Impurity Driven Phase Transition in the Antiferromagnetic Spin-1 Chain

Details An Impurity Driven Phase Transition in the Antiferromagnetic Spin-1 Chain An Impurity Driven Phase Transition in the Antiferromagnetic Spin-1 Chain

1996-08-07

arxiv.org/abs/cond-mat/9608039v1

Physics

Condensed Matter

12 pages, revtex, no figures

Scientific paper

10.1103/PhysRevLett.78.1783

Using an asymptotically exact real space renormalization procedure, we find that the Heisenberg antiferromagnetic spin-1 chain undergoes an impurity driven second order phase transition from the Haldane phase to the random singlet phase, as the bond distribution is broadened. In the Haldane phase and near the critical point, there is a Griffiths region in which the gap is filled and the susceptibility diverges in a non-universal manner. The correlation length critical exponent is approximately 2.3.

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