Random bond XXZ chains with modulated couplings

Details Random bond XXZ chains with modulated couplings Random bond XXZ chains with modulated couplings

2000-07-12

arxiv.org/abs/cond-mat/0007205v2

Phys.Rev.Lett.85(2000)4791-4794

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures. Final version to appear in PRL

Scientific paper

10.1103/PhysRevLett.85.4791

The magnetization behavior of q-periodic antiferromagnetic spin 1/2 Heisenberg chains under uniform magnetic fields is investigated in a background of disorder exchange distributions. By means of both real space decimation procedures and numerical diagonalizations in XX chains, it is found that for binary disorder the magnetization exhibits wide plateaux at values of 1+2(p-1)/q, where p is the disorder strength. In contrast, no spin gaps are observed in the presence of continuous exchange distributions. We also study the magnetic susceptibility at low magnetic fields. For odd q-modulations the susceptibility exhibits a universal singularity, whereas for q even it displays a non-universal power law behavior depending on the parameters of the distribution.

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