Abstract
The static and dynamic magnetic behavior of β-LiFeO2 has been investigated by measuring dc and ac susceptibilities. The zero-field-cooled (ZFC) and field-cooled (FC) curves reveal an irreversibility behavior at about 156 K and a broad peak at 129 K, indicating a spin glass transition. However, the dc susceptibility of β-LiFeO2 in FC mode differs from a flat curve as expected for a homogeneous spin glass by an increase below Tirr, which is the characteristic magnetic behavior of a cluster spin glass. The real part of the ac susceptibility shows a broad maximum at 135 K, which shifts to higher temperatures and becomes less pronounced with increasing frequency. The corresponding parameter δ=ΔTf/TfΔlogω = 0.005 is calculated for β-LiFeO2, suggesting a spin glass state rather than superparamagnetism. In addition, three models (the Néel–Arrhenius law, the Vogel–Fulcher law, and the power law) have also been employed to analyze the frequency dependence of Tf, which confirm a cluster spin glass state in β-LiFeO2.
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