Single-crystal growth and anisotropic magnetic properties of nonstoichiometric 
three-layer sodium cobalt oxides

Chen, D. P.; Wang, X. L.; Lin, C. T.; Dou, S. X.

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Single-crystal growth and anisotropic magnetic properties of nonstoichiometric three-layer sodium cobalt oxides

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Chen, D. P.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Lin, C. T.
Scientific Facility Crystal Growth (Masahiko Isobe), Max Planck Institute for Solid State Research, Max Planck Society;

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Chen, D. P., Wang, X. L., Lin, C. T., & Dou, S. X. (2007). Single-crystal growth and anisotropic magnetic properties of nonstoichiometric three-layer sodium cobalt oxides. Physical Review B, 76(13): 134511.

Cite as: https://hdl.handle.net/21.11116/0000-000E-B681-2

Abstract

Large single crystals of alpha-NaxCoO2 (x=0.91, 0.92, and 0.93) have been successfully fabricated by using the traveling solvent floating zone method. Details on the crystal growth are discussed. The crystal structures were characterized using powder x-ray diffraction and Rietveld refinement. The magnetic susceptibility measurements show that the magnetic properties depend strongly on x. The compound was found to be antiferromagnetic at T-N approximate to 20 K for x=0.91 and x=0.92, and paramagnetic for x=0.93. The in-plane and out-of-plane anisotropies were observed for the x=0.91 crystals. In addition, the derived anisotropic g-factor ratios (g(ab)/g(c)) from the anisotropic susceptibility along H parallel to ab and H parallel to c decreased significantly as the sodium composition increased from x=0.91 to x=0.93.