Effect of hydrostatic pressure on the superconductivity in NaxCoO2⋅yH2O
B. Lorenz, J. Cmaidalka, R. L. Meng, C. W. Chu
DOI 10.1103/PhysRevB.68.132504 · Physical Review B
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Abstract
The effect of hydrostatic pressure on the superconducting transition temperature of Na0.35CoO2⋅yH2O was investigated by ac susceptibility measurements up to 1.6 GPa. The pressure coefficient of Tc is negative and the dependence Tc(p) is nonlinear over the pressure range investigated. The magnitude of the average dlnTc/dp≈−0.07GPa−1 is comparable to the pressure coefficient of electron-doped high-Tc copper oxide superconductors with a similar value of Tc. Our results provide support to the assumption of two-dimensional superconductivity in Na0.35CoO2⋅yH2O, which is similar to the cuprate systems, and suggest that intercalation of larger molecules may lead to an enhancement of Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Na0.35CoO2*yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure unresolved | onset |
| Na0.35CoO2*yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.2 | 1.53 GPa | onset |
| Sm1.88Ce0.12CuO4 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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