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Durham University

Department of Physics

Staff profile

Publication details for Professor Tom Lancaster

Baker, P.J., Lancaster, T., Blundell, S.J., Brooks, M.L., Hayes, W., Prabhakaran, D. & Pratt, F.L. (2006). Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2. Physica B: Condensed Matter 374-375: 47-50.

Author(s) from Durham


We report muon-spin rotation, heat capacity, magnetization, and AC magnetic susceptibility measurements of the magnetic properties of the layered spin-1/2 antiferromagnet NaNiO2. These show the onset of long-range magnetic order below View the MathML source. The temperature dependence of the muon precession frequency suggests 2D XY magnetic ordering. Rapid muon depolarization persisting to about View the MathML source above TN is consistent with the presence of short-range magnetic order. Our AC susceptibility measurements suggest that magnetic clusters persist above View the MathML source, with their volume fraction decreasing with increasing temperature, and that there is a slowing of spin fluctuations at View the MathML source. A partial magnetic phase diagram has been deduced.