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Full-Text Articles in Physical Sciences and Mathematics
Elliptical Hole Pockets In The Fermi Surfaces Of Unhydrated And Hydrated Sodium Cobalt Oxides, J Laverock, S B. Dugdale, J A. Duffy, J Wooldridge, G Balakrishnan, M R. Lees, G.-Q Zheng, Dapeng Chen, C T. Lin, Y Sakurai
Elliptical Hole Pockets In The Fermi Surfaces Of Unhydrated And Hydrated Sodium Cobalt Oxides, J Laverock, S B. Dugdale, J A. Duffy, J Wooldridge, G Balakrishnan, M R. Lees, G.-Q Zheng, Dapeng Chen, C T. Lin, Y Sakurai
Australian Institute for Innovative Materials - Papers
The surprise discovery of superconductivity below 5 K in sodium cobalt oxides when hydrated with water has caught the attention of experimentalists and theorists alike. Most explanations for its occurence have focused heavily on the properties of some small elliptically shaped pockets predicted to be the electronically dominant Fermi surface sheet, but direct attempts to look for them have instead cast serious doubts over their existence. Here we present evidence that these pockets do indeed exist, based on bulk measurements of the electron momentum distribution in unhydrated and hydrated sodium cobalt oxides using the technique of x-ray Compton scattering.
Single-Crystal Growth And Anisotropic Magnetic Properties Of Nonstoichiometric Three-Layer Sodium Cobalt Oxides, Dapeng Chen, Xiaolin Wang, C T Lin, S X. Dou
Single-Crystal Growth And Anisotropic Magnetic Properties Of Nonstoichiometric Three-Layer Sodium Cobalt Oxides, Dapeng Chen, Xiaolin Wang, C T Lin, S X. Dou
Australian Institute for Innovative Materials - Papers
Large single crystals of α-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 TN ≈ 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 (gab /gc) …