Possible coexistence of s-wave and unconventional pairing in Na_xCoO_2-yH2O:a new insight from impurity effects

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dc.creatorChen, Y. -J.
dc.creatorLiu, C. -J.
dc.creatorWang, J. -S.
dc.creatorLin, J. -Y.
dc.creatorSun, C. P.
dc.creatorHuang, S. W.
dc.creatorLee, J. M.
dc.creatorChen, J. M.
dc.creatorLee, J. F.
dc.creatorLiu, D. G.
dc.creatorYang, H. D.
dc.date2005-11-16
dc.date2006-06-07
dc.date.accessioned2026-07-07T08:30:08Z
dc.date.available2026-07-07T08:30:08Z
dc.descriptionTo 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.
dc.description5 pages; 5 figures; evidence of two phases in Na_xCoO_2-yH2O from the specific heat experiments
dc.identifierhttps://arxiv.org/abs/cond-mat/0511385
dc.identifierhttp://arxiv.org/abs/cond-mat/0511385
dc.identifierA revised paper slightly different from the present manuscript is published as Physical Review B 76, 092501 (2007)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/138165
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titlePossible coexistence of s-wave and unconventional pairing in Na_xCoO_2-yH2O:a new insight from impurity effects
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