Abstract
To shed light on the symmetry of the superconducting order parameter in ${\mathrm{Na}}_{x}\mathrm{Co}{\mathrm{O}}_{2}∙y{\mathrm{H}}_{2}\mathrm{O}$, the Mn doping effects are studied. X-ray absorption spectroscopy verifies that the doped Mn impurities occupy the Co sites and are with a valance close to $+4$. Impurity scattering by Mn is in the unitary limit that, however, does not lead to strong ${T}_{c}$ suppression. This absence of the strong impurity effects on ${T}_{c}$ is inconsistent with the simple picture of a sign-changing order parameter. Coexistence of the $s$-wave superconducting order parameter and the nodal one is proposed to reconcile all the existing experiments and has been implied by the specific heat experiments.
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