engleski

New contribution to the thermopower of o-TaS3

We report on the thermopower investigation of the pure orthorhombic TaS3 in temperature interval from 300 K down to 25 K and the doped one by Nb (Ta0.995Nb0.005S3) down to 80 K. Our results are in gross in agreement with the previously reported thermopower. However, we give an evidence of a change of slope at 150 K, before reaching a well defined maximum at 100 K. Below the maximum the thermopower shows hysteretic behavior in temperature cycling. This effect disappears at 60 K, where the thermopower becomes negative and finally drops into a minimum at 30 K. This characteristic change of sign comes from the contribution of the soliton-like excitations.

charge density wave; thermopower; hysteresis; doping

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