Physics – Condensed Matter – Superconductivity
Scientific paper
2005-11-16
A revised paper slightly different from the present manuscript is published as Physical Review B 76, 092501 (2007)
Physics
Condensed Matter
Superconductivity
5 pages; 5 figures; evidence of two phases in Na_xCoO_2-yH2O from the specific heat experiments
Scientific paper
To shed light on the symmetry of the superconducting order parameter in Na_xCoO_2-yH_2O, 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 Tc suppression. This absence of the strong impurity effects on T_c is not consistent with the simple picture of a sign-changing order parameter. Coexistence of the s-wave and unconventional order parameters is proposed to reconcile all existing experiments and has been directly observed by the specific heat experiments.
Chen Jie-Min
Chen Yongshun John
Huang Shih-Wei
Lee Jin-Fa
Lee John M.
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