Eur. Phys. J. Special Topics 141, 69-72 (2007)
https://doi.org/10.1140/epjst/e2007-00020-4

Rotational motion of the water molecules in the superconductor Na_0.28CoO2·yH₂O

Hahn-Meitner-Institut, Glienicker Strae 100, Berlin, Germany

Abstract

Quasielastic neutron scattering (QENS) has been used to investigate the dynamical behaviour of H₂O in the superconductor Na_0.28CoO₂ .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.