We use cookies to ensure that we give you the best experience on our website. You can change your cookie settings at any time. Otherwise, we'll assume you're OK to continue.

Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Lancaster, T., Blundell, S.J., Baker, P.J., Hayes, W., Giblin, S.R., McLain, S.E., Pratt, F.L., Salman, Z., Jacobs, E.A., Turner, J.F.C. & Barnes, T. (2007). Intrinsic magnetic order in Cs2AgF4 detected by muon-spin relaxation. Physical review B 75(22): 220408(R).

Author(s) from Durham


We present the results of a muon-spin relaxation study of the high-Tc analog material Cs2AgF4. We find unambiguous evidence for magnetic order, intrinsic to the material, below TC=13.95(3)K. The ratio of interplane to intraplane coupling is estimated to be ∣∣J′/J∣=1.9×10−2, while fits of the temperature dependence of the order parameter reveal a critical exponent β=0.292(3), implying an intermediate character between pure two- and three-dimensional magnetism in the critical regime. Above TC we observe a signal characteristic of dipolar interactions due to linear F−μ+−F bonds, allowing the muon stopping sites in this compound to be characterized.