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Tunnelling spectroscopy investigation of the CDW state in

Tunnelling spectroscopy measurements were carried out on the mixed crystal to investigate the change in the density of states in the CDW state. The temperature dependences of the CDW energy gap widths were obtained. Experiments showed that the flattening of the peak in the curve with increasing x corresponds to the decrease in the CDW energy gap. A model was proposed in which the anomalous characteristics in this system were explained in terms of the competition of the two conduction mechanisms associated with the metallic carriers and the `excitonic' carriers.