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Hydration phase diagram for sodium cobalt oxide Na0.3CoO2*yH2O
M. L. Foo, T. Klimczuk, R. J. Cava
The hydration phase diagram for sodium cobalt oxyhydrate, Na0.3CoO2*yH2O (y=0, 0.6, 1.3), was determined as a function of relative humidity at 298K. It is found that greater than 7…
Heat Capacity of NaCoO1.3HO, a New Two-Gap Superconductor: Comparison with the Heat Capacity of MgB
N. Oeschler, R. A. Fisher, N. E. Phillips +3
The superconducting-state heat capacity of NaCoO1.3HO shows unusual, marked deviations from BCS theory, at all temperatures. At low temperatures the heat…
Coupling between electronic and structural degrees of freedom in the triangular lattice conductor NaxCoO2
Q. Huang, M. L. Foo, R. A. Pascal +5
The determination by powder neutron diffraction of the ambient temperature crystal structures of compounds in the NaxCoO2 family, for 0.3 < x <= 1.0, is reported. The structures co…
Superconductivity in three-layer Na0.3CoO2*1.3H2O
M. L. Foo, T. Klimczuk, Lu Li +2
The observation of superconductivity at 4.3 K in a new crystalline form of Na0.3CoO2*1.3H2O is reported. The new superconductor has three layers of CoO6 octahedra per crystallograp…
Low temperature phase transitions and crystal structure of Na0.5CoO2
Q. Huang, M. L. Foo, J. W. Lynn +7
The crystal structure of Na0.5CoO2, determined by powder neutron diffraction, is reported. The structure consists of layers of edge-shared CoO6 octahedra in a triangular lattice, w…
Sodium Ion Ordering in NaxCoO2
H. W. Zandbergen, M. L. Foo, Q. Xu +2
The layered sodium cobalt oxide NaxCoO2 is studied by electron diffraction for a wide range of sodium contents, 0.15<x<0.75. An extensive series of ordered Na ion-Na vacancy superl…