Effect of Hydrostatic Pressure on the Superconductivity in NaxCoO2.yH2O

Details Effect of Hydrostatic Pressure on the Superconductivity in NaxCoO2.yH2O Effect of Hydrostatic Pressure on the Superconductivity in NaxCoO2.yH2O

2003-04-23

arxiv.org/abs/cond-mat/0304537v2

Phys. Rev. B 68, 132504 (2003)

Physics

Condensed Matter

Superconductivity

Revised Manuscript

Scientific paper

10.1103/PhysRevB.68.132504

The effect of hydrostatic pressure on the superconducting transition temperature of Na{0.35}CoO{2}.yH{2}O was investigated by ac susceptibility measurements up to 1.6 GPa. The pressure coefficient of T{c} is negative and the dependence T{c}(p) is nonlinear over the pressure range investigated. The magnitude of the average dlnT{c}/dp=-0.07 GPa^{-1} is comparable to the pressure coefficient of electron-doped high-T{c} copper oxide superconductors with a similar value of T{c}. Our results provide support to the assumption of two-dimensional superconductivity in Na{0.35}CoO{2}.yH{2}O, which is similar to the cuprate systems, and suggest that intercalation of larger molecules may lead to an enhancement of T{c}.

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