Precise Control of Band Filling in NaxCoO2

Details Precise Control of Band Filling in NaxCoO2 Precise Control of Band Filling in NaxCoO2

2007-04-09

arxiv.org/abs/0704.1065v1

J. Phys. Soc. Jpn. 76 (2007) 063705

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.76.063705

Electronic properties of the sodium cobaltate NaxCoO2 are systematically studied through a precise control of band filling. Resistivity, magnetic susceptibility and specific heat measurements are carried out on a series of high-quality polycrystalline samples prepared at 200 C with Na content in a wide range of 0.35 =< x =< 0.70. It is found that dramatic changes in electronic properties take place at a critical Na concentration x* that lies between 0.58 and 0.59, which separates a Pauli paramagnetic and a Curie-Weiss metals. It is suggested that at x* the Fermi level touches the bottom of the a1g band at the gamma point, leading to a crucial change in the density of states across x* and the emergence of a small electron pocket around the gamma point for x > x*.

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