Thermodynamic and magnetic properties of the layered triangular magnet NaNiO2

Abstract

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.

arXiv comment4 pages, 4 figures

References in corpus (10)

• Spin-polarized muons in condensed matter physics
• Observation of extended scattering continua characteristic of spin fractionalization in the 2D frustrated quantum magnet Cs2CuCl4 by neutron scattering
• Muon spin rotation and relaxation in magnetic materials
• Triangular Antiferromagnets
• Orbital degeneracy as a source of frustration in LiNiO${}_2$
• Orbital and spin physics in LiNiO2 and NaNiO2
• Anisotropic Superexchange for nearest and next nearest coppers in chain, ladder and lamellar cuprates
• Ordering and Spin Waves in NaNiO2 : A Stacked Quantum Ferromagnet
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Cited by in corpus (6)

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• Anomalous temperature evolution of the internal magnetic field distribution in the charge-ordered triangular antiferromagnet AgNiO2
• Honeycomb Layered Frameworks with Metallophilic Bilayers
• Co-existence of short- and long-range magnetic order in LaCo${}_2$P${}_2$
• Magnetic phase diagram of the S=1/2 triangular layered compound NaNiO2: a single crystal study
• Possible Bose-Einstein condensation of magnons in a S = 5/2 honeycomb lattice