1. Effects of Mn and Ti doping on superconductivity in Na0.3CoO2 ·1.3H2O and charge ordering in Na0.5CoO2
- Author
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Shi, Y.G., Yang, H.X., Liu, X., Ma, W.J., Nie, C.J., Huang, W.W., and Li, J.Q.
- Subjects
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SUPERCONDUCTIVITY , *ELECTRIC conductivity , *FERROMAGNETISM , *SEMICONDUCTOR doping - Abstract
Abstract: The superconductivity in Na0.3Co1−x M x O2 ·1.3H2O and the charge ordering in Na0.5Co1−x M x O2 have been investigated for M=Mn and Ti substitution for Co. Single-phased Na0.5Co1−x M x O2 (0⩽ x ⩽0.1, M=Mn, Ti) materials were prepared by Na deintercalation from Na0.75Co1−x M x O2; the hydrated Na0.3Co1−x M x O2 ·1.3H2O (0⩽ x ⩽0.1, M=Mn, Ti) materials were prepared by Na deintercalation and then water intercalation. Measurements of physical properties demonstrated that the superconductivity in Na0.3Co1−x M x O2 ·1.3H2O is evidently influenced by the Co-site doping and completely ceases at x =0.02 for Mn doping and x =0.01 for Ti doping. Analysis of resistivity and magnetization on Na0.5Co1−x M x O2 revealed that Mn doping has much stronger influence than Ti doping on both the charge ordering and the low-temperature physical properties. [Copyright &y& Elsevier]
- Published
- 2005
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