Abstract
We have studied the crystal structure and transport properties of the new cobalt oxide (CaOH) 1.14CoO 2. The compound has the layer structure, which consists of CdI 2-type CoO 2 layers and rock-salt-type double CaOH atomic layers. The two subcells have incommensurate periodicity along the a-axis, resulting in a modulated crystal structure due to the inter-subcell interaction. The structural modulation affects carrier conduction through the potential randomness. We found that the two-dimensional (2-D) variable-range-hopping-type hole conduction is dominant at low temperature.
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