Abstract
The superconductivity in Na 0.3Co 1− x M x O 2 · 1.3H 2O and the charge ordering in Na 0.5Co 1− x M x O 2 have been investigated for M = Mn and Ti substitution for Co. Single-phased Na 0.5Co 1− x M x O 2 (0 ⩽ x ⩽ 0.1, M = Mn, Ti) materials were prepared by Na deintercalation from Na 0.75Co 1− x M x O 2; the hydrated Na 0.3Co 1− x M x O 2 · 1.3H 2O (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 Na 0.3Co 1− x M x O 2 · 1.3H 2O 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 Na 0.5Co 1− x M x O 2 revealed that Mn doping has much stronger influence than Ti doping on both the charge ordering and the low-temperature physical properties.
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