Precise Control of Band Filling in Na<I><SUB>x</SUB></I>CoO<SUB>2</SUB>

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  • Precise control of band filling in NaxCoO2
  • Precise Control of Band Filling in Na<sub><i>x</i></sub>CoO<sub>2</sub>

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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 Γ point, leading to a crucial change in the density of states across x* and the emergence of a small electron pocket around the Γ point for x>x*.

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