Abstract
Results on the in-plane thermopower and thermal conductivity of first stages FeCl 3 and CoCl 2 graphite intercalation compounds and of a CoCl 2AlCl 3 biintercalation compound are reported. Around the magnetic phase transition temperature, the thermopowers of the two first stage magnetic compounds are much larger than those observed in non magnetic compounds. The effect is less pronounced in the biintercalation compound. For the FeCl 3 compound, a hump in the thermal conductivity is also observed around 5.5K. We suggest that these anomalies should be attributed to magnons, in agreement with other experiments previously reported on such magnetic compounds.
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