Abstract
Magnetotransport properties of quasi-two-dimensional thallium purplebronze were measured at different magnetic fields for H∥c. Huge positive magnetoresistance below thePeierls transition TP and Shubnikov-de Haas oscillation in thehigh-field range were found. In the charge-density-wave (CDW) statebelow TP, nonlinearity of the voltage-current characteristicsdue to the depinning of a CDW was also observed at 2 K and 14 T.These results supported the suggestion that the CDW gap openingbelow TP still leaves small electron and/or hole pockets, but anapplied magnetic field can remove these pockets to a great extent,thus leading to an enhanced gap.
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