Publication details for Professor Tom LancasterBaker, 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.
- Publication type: Journal Article
- ISSN/ISBN: 1098-0121, 1550-235X
- DOI: 10.1103/PhysRevB.75.094404
- Further publication details on publisher web site
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.