Strong exchange narrowing in new two-dimensional paramagnetic systems

Spin Dynamics in the Paramagnetic Regime: NMR and EPR in Two-Dimensional Magnets

“…Increasing the angle (), which is the angle between the c-axis (perpendicular to the planes) and the magnetic field, from O· to 90·, the experimental peak-to-peak linewidth rapidly decreases, passes a shallow minimum and increases again. A similar linewidth anisotropy has been observed in many other layer compounds [17,25,26). This angular dependence is in contrast to the 3-d case where the linewidth shows a monotonic decrease proportional to 1 + cos 2 () [1,27).…”

Phase transitions and magnetism in layer-structured(C18H37NHLee1, Lee2, Lee3 2003Phys. Rev. B91110View full textAdd to dashboardCite

“…5 In particular, an angular dependence of EPR signals characteristic of two-dimensional magnetism was explicitly observed in (C n H 2nϩ1 NH 3 ) 2 MnCl 4 with shorter hydrocarbon chains (nϭ2 and 3͒. 6 In K 2 MnF 4 it was shown that, in the presence of two-dimensional spin diffusion, the EPR linewidth shows the same temperature dependence as the susceptibility multiplied by the temperature (T). 7 The CnMn system represents a two-dimensional Heisenberg antiferromagnet below liquid nitrogen temperature.…”

Magnetic ordering in two-dimensional Heisenberg antiferromagnets with variable interlayer distances

“…9 In particular, an angular dependence of EPR signals characteristic of two-dimensional magnetism was explicitly observed in CnMn with shorter hydrocarbon chains (nϭ2 and 3͒. 10 According to the studies for short-chain compounds, the magnetic moments in the antiferromagnetic phase are aligned along the layer-normal direction alternately pointing in opposite directions. Accordingly, the CnMn system has the layer-normal direction as an easy axis and so an Ising type of anisotropy.…”