Volume 81, Number 4, February 2008
|Number of page(s)||4|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 January 2008|
Transport and pressure properties of single crystals with metallic ground state
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
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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