Rotational motion of the water molecules in the superconductor Na0.28CoO2·yH2O
Hahn-Meitner-Institut, Glienicker Strae 100, Berlin, Germany
Quasielastic neutron scattering (QENS) has been used to investigate the dynamical behaviour of H2O in the superconductor Na0.28CoO2 .yH2O. The measurements were obtained at room temperature for a molar concentration of water, y = 1.3. From the analysis of the Q-dependence of the EISF and the line-width we found that the water dynamics can be well described by rotational motion that likely correspond to re-orientation of the H2O molecule. We were also able to define a rotational correlation time of τ= 1.85 ps.
© EDP Sciences, Springer-Verlag, 2007