Low-lying excitations and magnetization process of coupled tetrahedral systems

Abstract

We investigate low-lying singlet and triplet excitations and the magnetization process of quasi-1D spin systems composed of tetrahedral spin clusters. For a class of such models, we found various exact low-lying excitations; some of them are responsible for the first-order transition between two different ground states formed by local singlets. Moreover, we find that there are two different kinds of magnetization plateaus which are separated by a first-order transition.

To appear in Phys.Rev.B (Issue 01 August 2002). A short comment is added

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