Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

Conference item

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 T-N = 19.5K. The temperature dependence of the muon precession frequency suggests 2D XY magnetic ordering. Rapid muon depolarization persisting to about 5 K above TN is consistent with the presence of short-range magnetic order. Our AC susceptibility measurements suggest that magnetic clusters persist above 25 K, with their volume fraction decreasing with increasing temperature, and that there is a slowing of spin fluctuations at T-sf = 3 K. A partial magnetic phase diagram has been deduced. (c) 2006 Elsevier B.V. All rights reserved.

Authors: Baker, P; Lancaster, T; Blundell, S; Brooks, M; Hayes, W

• Publication status: Published
• Journal: PHYSICA B-CONDENSED MATTER
• Volume: 374
• Pages: 47-50
• Publication date: 2006-03-31
• Event title: 10th International Conference on Muon Spin Rotation, Relaxation and Resonance
• DOI: 10.1016/j.physb.2005.11.162
• ISSN: 0921-4526
• Keywords: triangular lattice; sodium nickelate; muon-spin rotation; antiferromagnet