Pressure effects in the triangular layered cobaltites NaxCoO2

Details Pressure effects in the triangular layered cobaltites NaxCoO2 Pressure effects in the triangular layered cobaltites NaxCoO2

2007-10-23

arxiv.org/abs/0710.4341v1

Physics

Condensed Matter

Strongly Correlated Electrons

18 pages, 5 figures

Scientific paper

10.1103/PhysRevB.77.064105

We have measured transport properties as a function of temperature and pressure up to 30GPa in the NaxCoO2 system. For the x=0.5 sample the transition temperature at 53K increases with pressure, while paradoxically the sample passes from an insulating to a metallic ground state. A similar transition is observed in the x=0.31 sample under pressure. Compression on the x=0.75 sample transforms the sample from a metallic to an insulating state. We discuss our results in terms of interactions between band structure effects and Na+ order.

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