| Issue |
EPL
Volume 81, Number 4, February 2008
|
|
|---|---|---|
| Article Number | 47005 | |
| Number of page(s) | 4 | |
| Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
| DOI | https://doi.org/10.1209/0295-5075/81/47005 | |
| Published online | 22 January 2008 | |
Transport and pressure properties of 
single crystals with metallic ground state
1
Institut NEEL, CNRS and Université Joseph Fourier - BP 166 Bât E, F-38042 Grenoble Cedex 9, France
2
Laboratoire réactivité et chimie des solides (LRCS), Université Picardie Jules-Verne Amiens - 33, Rue Saint-Leu, F-80039 Amiens Cedex 1, France
Received:
24
October
2007
Accepted:
18
December
2007
We report transport properties as a function of temperature and pressure up to 16 GPa in single crystals of NaxCoO2. Our x = 0.5-δ samples, obtained by a novel de-intercalation method, present the transitions characteristic of 
samples, albeit with a metallic ground state at low temperatures. Besides the obvious consequences of the sub-stoichiometry of our samples, we present evidence suggesting that an insulator state can be induced by disorder that localizes the few carriers left after the transitions.
PACS: 72.80.Ga – Transition-metal compounds / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 62.50.+p – High-pressure and shock wave effects in solids and liquids
© EPLA, 2008
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