Anomalous high-temperature Hall effect on the triangular lattice in NaxCoO2
Abstract
The Hall coefficient RH of NaxCoO2 (x = 0.68) behaves anomalously at high temperatures. From 200 to 500 K, RH increases linearly with T to 8 times the expected Drude value, with no sign of saturation. Together with the thermopower Q, the behavior of RH provides firm evidence for strong correlation. We discuss the effect of hopping on a triangular lattice and compare RH with a recent prediction by Kumar and Shastry.
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