Chemical Instability of the Cobalt Oxyhydrate Superconductor under Ambient Conditions

Details Chemical Instability of the Cobalt Oxyhydrate Superconductor under Ambient Conditions Chemical Instability of the Cobalt Oxyhydrate Superconductor under Ambient Conditions

2003-04-21

arxiv.org/abs/cond-mat/0304464v1

Solid State Communications, 127 (2003) 33

Physics

Condensed Matter

Superconductivity

10 pages and 4 figures

Scientific paper

10.1016/S0038-1098(03)00334-X

The layered sodium cobalt oxyhydrate superconductor Na0.3CoO2*1.4H2O is shown through X-ray diffraction and thermogravimetric studies to be one of a series of hydrated phases of Na0.3CoO2. Further, it is shown that the material is exceptionally sensitive to both temperature and humidity near ambient conditions, easily dehydrating to a non-superconducting lower hydrate. The observation of this stable lower hydrate with c=13.8 angstroms implies that the superconductivity turns on in this system between CoO2 layer spacings of 6.9 and 9.9 angstroms at nominally constant chemical doping.

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