Spin gap formation in the quantum spin systems TiOX, X=Cl and Br

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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5 figures, 15 pages, further information see http://www.peter-lemmens.de

Scientific paper

10.1088/1367-2630/7/1/074

In the layered quantum spin systems TiOCl and TiOBr the magnetic susceptibility shows a very weak temperature dependence at high temperatures and transition-induced phenomena at low temperatures. There is a clear connection of the observed transition temperatures to the distortion of the octahedra and the layer separation. Band structure calculations point to a relation of the local coordinations and the dimensionality of the magnetic properties. While from magnetic Raman scattering only a small decrease of the magnetic exchange by -5-10% is derived comparing TiOCl with TiOBr, the temperature dependence of the magnetic susceptibility favors a much bigger change.

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