Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings

Details Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings Generation of Large Moments in a Spin-1 Chain with Random Antiferromagnetic Couplings

1997-12-19

arxiv.org/abs/cond-mat/9712252v1

Phys. Rev. Lett. 80, 4562 (1998).

Physics

Condensed Matter

4 pages, 4 eps figures

Scientific paper

10.1103/PhysRevLett.80.4562

We study the spin-1 chain with nearest neighbor couplings that are rotationally invariant, but include both Heisenberg and biquadratic exchange, with random strengths. We demonstrate, using perturbative renormalization group methods as well as exact diagonalization of clusters, that the system generates ferromagnetic couplings under certain circumstances even when all the bare couplings are antiferromagnetic. This disorder induced instability leads to formation of large magnetic moments at low temperatures, and is a purely quantum mechanical effect that does not have a classical counterpart. The physical origin of this instability, as well as its consequences, are discussed.

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