Superconductivity, charge ordering, and structural properties of α- and β−NaxCoO2∙y(H2O,D2O)
Y. G. Shi, H. X. Yang, H. Huang, X. Liu, J. Q. Li
DOI 10.1103/PhysRevB.73.094505 · Physical Review B
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Abstract
Two series of α- and β−NaxCoO2 materials have been prepared by means of Na deintercalation from the α−NaCoO2 and β−Na0.6CoO2 parent phases, respectively. The α−NaxCoO2 materials undergo a clear phase transition from the hexagonal to the β-phase-like monoclinic structure along with the Na deintercalation. Measurements of resistivity and magnetization demonstrated the presence of notable charge ordering transitions in both α- and β−NaxCoO2 with 0.4<x<0.5 below 100K. Bulk superconductivity has been observed in the hydrated α−NaxCoO2∙1.3H2O at ∼4.2K and in β−NaxCoO2∙1.3H2O at ∼4.3K. Intercalation of D2O in either α- or β−Na0.33CoO2 also yields superconductivity at slightly lower temperatures.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.31CoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | Pressure not reported | onset |
| Na0.29CoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.3 | Pressure not reported | onset |
| Na0.3CoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | unknown |
| Na0.3CoO2.1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.6 | Pressure not reported | unknown |
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