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Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

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arxiv cond-mat/0506141 v1 pith:RKD54HG5 submitted 2005-06-06 cond-mat.str-el

Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

P. J. Baker , T. Lancaster , S. J. Blundell , M. L. Brooks , W. Hayes , D. Prabhakaran , F. L. Pratt This is my paper
classification cond-mat.str-el
keywords magneticsusceptibilitytemperatureaboveconsistentfrequencylayerednanio2
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We report muon-spin rotation, heat capacity, magnetization, and ac magnetic susceptibility measurements of the layered spin-1/2 antiferromagnet NaNiO2. These show the onset of long-range magnetic order below T_N = 19.5K. Rapid muon depolarization persisting to about 5K above T_N 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 25K in the paramagnetic state and that their volume fraction decreases with increasing temperature. A frequency dependent peak in the ac magnetic susceptibility at T_sf = 3K is observed, consistent with a slowing of spin fluctuations at this temperature. A partial magnetic phase diagram is deduced.

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