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

Lemmens, P. ; Choi, K. Y. ; Valenti, R. ; Saha-Dasgupta, T. ; Abel, E. ; Lee, Y. S. ; Chou, F. C. (2005) Spin gap formation in the quantum spin systems TiOX, X = Cl and Br New Journal of Physics, 7 . p. 74. ISSN 1367-2630

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Official URL: http://iopscience.iop.org/1367-2630/7/1/074

Related URL: http://dx.doi.org/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 between the observed transition temperatures and the distortion of the octahedra and the layer separation. Band structure calculations point to a relation between 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 to 10% is derived comparing TiOCl with TiOBr, the temperature dependence of the magnetic susceptibility favours a much bigger change.

Item Type:Article
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Deposited On:15 Oct 2011 11:55
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