Abstract
The magnetic field and x dependence of the electrical resistivity of Na x CoO 2 ( 0.70 ⩽ x ⩽ 0.78 ) are investigated. For x = 0.74 and 0.76, the resistivity ρ behaves as ρ = AT α ( T: temperature) with α ≃ 2 between 2 K and about 7 K, as expected for a Fermi liquid system. However, α decreases down to ∼ 1 at x = 0.70 and A increases prominently with decreasing x. Moreover, the changes in α and A are suppressed by a magnetic field H. These facts strongly suggest that a quantum critical point is located just below x = 0.70 at H = 0 .
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