Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

Journal article

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 TN=19.5 K. Rapid muon depolarization, persisting from TN to about 5 K above TN, is consistent with the presence of short-range magnetic order. The temperature and frequency dependence of the ac susceptibility suggests that magnetic clusters persist above 25 K and that their volume fraction decreases with increasing temperature. A frequency dependent peak in the ac magnetic susceptibility at Tsf=3 K is observed, consistent with a slowing of spin fluctuations at this temperature. A partial magnetic phase diagram is deduced.

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

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review B
• Volume: 72
• Issue: 10
• Article number: 104414
• Publication date: 2005-09-01
• DOI: 10.1103/PhysRevB.72.104414
• EISSN: 1550-235x
• ISSN: 1098-0121
• Language: English
• Keywords: magnetic susceptibility; heat capacity; muon-spin rotation; antiferromagnet; magnetization
• Subjects: Condensed Matter Physics; Physics