標題: Effect of Mn impurities on the superconductivity in NaxCoO2 center dot yH(2)O
作者: Chen, Y.-J.
Liu, C.-J.
Wang, J.-S.
Lin, J.-Y.
Sun, C. P.
Huang, S. W.
Lee, J. M.
Chen, J. M.
Lee, J. F.
Liu, D. G.
Yang, H. D.
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 1-Sep-2007
摘要: To shed light on the symmetry of the superconducting order parameter in NaxCoO2 center dot yH(2)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.
URI: http://dx.doi.org/10.1103/PhysRevB.76.092501
http://hdl.handle.net/11536/10350
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.76.092501
期刊: PHYSICAL REVIEW B
Volume: 76
Issue: 9
起始頁: 0
結束頁: 0
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