Low-lying excitations and magnetization process of coupled tetrahedral systems

Details Low-lying excitations and magnetization process of coupled tetrahedral systems Low-lying excitations and magnetization process of coupled tetrahedral systems

2002-07-06

arxiv.org/abs/cond-mat/0207176v1

Phys.Rev.B66 054435(2002)

Physics

Condensed Matter

Statistical Mechanics

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

Scientific paper

10.1103/PhysRevB.66.054435

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.

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