Abstract
Thermoelectric power in c -direction ( S c ) of highly oriented pyrolytic graphite (HOPG) exhibits a sharp negative dip around 20–30 K. This anomaly is ascribed to the phonon drag thermoelectric power ( S p ) related to the out-of-plane vibration and S p is calculated in close relation to the mechanism of c -axis conduction. Major contribution to S c comes from S p which can provide a qualitative explanation of the observed results.
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