Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1998-08-28
Phys. Rev. B59 (1999) 6790-6794
Physics
Condensed Matter
Strongly Correlated Electrons
5 pages REVTeX, three PostScript figures included using psfig.sty
Scientific paper
10.1103/PhysRevB.59.6790
Polymerized quantum spin chains (i.e. spin chains with a periodic modulation of the coupling constants) exhibit plateaux in their magnetization curves when subjected to homogeneous external magnetic fields. We argue that the strong-coupling limit yields a simple but general explanation for the appearance of plateaux as well as of the associated quantization condition on the magnetization. We then proceed to explicitly compute series for the plateau boundaries of trimerized and quadrumerized spin-1/2 chains. The picture is completed by a discussion how the universality classes associated to the transitions at the boundaries of magnetization plateaux arise in many cases from a first order strong-coupling effective Hamiltonian.
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