Abstract
NaxCoO2 (x>0.7) single crystals with a typical dimension of 0.4×0.4 mm2 have been prepared by a “rapid heat-up” technique. By the Benchtop Small Molecule X-ray Crystallography System, the samples have been confirmed to be a single phase of the hexagonal γ-NaxCoO2. Magnetic data from the crystal indicate a magnetic phase transition around T=30 K, and the transition is sensitive to the applied magnetic fields. This is most consistent with the formation of an antiferromagnetic spin-density-wave (SDW) with the easy axis for magnetization nearly along the c-axis. Weak and soft ferromagnetism has also been observed from the crystal at low temperature. This unconventional magnetic property may be ascribed to the effect of the small moments of Co4−x−δ sites at low temperature.
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