Dynamics of water in the Na0.3CoO2∙1.4H2O superconductor
V. García Sakai, E. Mamontov, J. W. Lynn, L. Viciu, R. J. Cava
DOI 10.1103/PhysRevB.75.014505 · Physical Review B
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Abstract
Quasielastic neutron scattering is employed to characterize the diffusion of water molecules that are present between the CoO2 layers in the 4.3K oxyhydrate superconductor Na0.3CoO2∙1.4H2O. Dynamic measurements were performed at temperatures between 3.5K and 315K. Significant quasielastic scattering was only observed for temperatures of 235K and higher where only highly constrained diffusive motion is present, similar to what is seen for water confined in pores. Approximately 80% and 100 % (depending on the temperature) of the water molecules remain immobile (i.e., frozen) on the time scale of the measurements (10−9s). For the mobile water molecules, a model in which the molecules perform localized jumps between Na sites can be used to describe the data. The dynamics of the mobile water molecules does not show a significant change at the superconducting transition temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.3CoO2*1.4H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | unknown |
| NaxTaS2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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