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.
@article{arxiv.cond-mat/0501577,
title = {Spin gap formation in the quantum spin systems TiOX, X=Cl and Br},
author = {P. Lemmens and K. Y. Choi and R. Valenti and T. Saha-Dasgupta and E. Abel and Y. S. Lee and F. C. Chou},
journal= {arXiv preprint arXiv:cond-mat/0501577},
year = {2010}
}
Comments
5 figures, 15 pages, further information see http://www.peter-lemmens.de