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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Baker, P.J., Blundell, S.J., Pratt, F.L., Lancaster, T., Brooks, M.L., Hayes, W., Isobe, M., Ueda, Y., Hoinkis, M., Sing, M., Klemm, M., Horn, S. & Claessen, R. (2007). Muon-spin relaxation measurements on the dimerized spin-1∕2 chains NaTiSi2O6 and TiOCl. Physical review B 75(9): 094404.

Author(s) from Durham


We report muon spin relaxation (μSR) and magnetic susceptibility investigations of two Ti3+(S=1∕2) chain compounds, NaTiSi2O6 and TiOCl, each of which exhibits a spin gap at low temperature. From these we conclude that the spin gap in NaTiSi2O6, which arises from orbital ordering at TOO=210K, is temperature independent below TOO, with a value of 2Δ=700(100)K. In TiOCl, we find thermally activated spin fluctuations corresponding to a spin gap 2Δ=440(60)K below Tc1=67K. We can describe both the μSR and susceptibility data in terms of a model based on the dimerization of the Ti3+ chains. We also compare the methods used to extract the spin gap and the concentration of free spins within the samples from μSR and magnetic susceptibility data.