Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2
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...
| Hauptverfasser: | , , , , , , |
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| Format: | Journal article |
| Sprache: | English |
| Veröffentlicht: |
American Physical Society
2005
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| Schlagworte: |
| Zusammenfassung: | 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. |
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