Observation of Bulk Superconductivity in NaxCoO2·yH2O and NaxCoO2·yD2O Powder and Single Crystals
R. Jin, B. C. Sales, P. Khalifah, D. Mandrus
DOI 10.1103/PhysRevLett.91.217001 · Physical Review Letters
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Abstract
Poly- and single-crystalline NaxCoO2 has been successfully intercalated with H2O and D2O as confirmed by x-ray diffraction and thermogravimetric analysis. Resistivity, magnetic susceptibility, and specific heat measurements show bulk superconductivity with Tc close to 5 K in both cases. The substitution of deuterium for hydrogen has an effect on Tc of less than 0.2 K. Investigation of the resistivity anisotropy of NaxCoO2·yH2O single crystals shows (a) almost zero resistivity below Tc, and (b) an abrupt upturn at T*∼52 K in both the ab plane and the c direction. The implications of our results on the possible superconducting mechanism will be discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.3CoO2·1.4H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| Na0.3CoO2·1.4D2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| Na0.3CoO2·1.4H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| Na0.3CoO2·1.4D2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | onset |
| Na0.3CoO2·1.4D2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | midpoint |
| Na0.3CoO2·1.4H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | midpoint |
| Na0.3CoO2·yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
| Na0.35CoO2·1.3H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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