Single-crystal growth and anisotropic magnetic properties of nonstoichiometric three-layer sodium cobalt oxides
- Institute for Superconducting and Electronic Materials, University of Wollongong, New South Wales 2500 (Australia)
- Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart (Germany)
Large single crystals of {alpha}-Na{sub x}CoO{sub 2} (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{sub N}{approx_equal}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{sub ab}/g{sub c}) from the anisotropic susceptibility along H parallel ab and H parallel c decreased significantly as the sodium composition increased from x=0.91 to x=0.93.
- OSTI ID:
- 21052703
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 76, Issue 13; Other Information: DOI: 10.1103/PhysRevB.76.134511; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
ANTIFERROMAGNETIC MATERIALS
ANTIFERROMAGNETISM
COBALT OXIDES
CRYSTAL GROWTH
CRYSTAL STRUCTURE
LANDE FACTOR
LAYERS
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
PARAMAGNETISM
POWDERS
SODIUM
SODIUM COMPOUNDS
X-RAY DIFFRACTION
ZONE MELTING