We consider the magnetoresistance oscillation phenomena in the Bechgaard salts (TMTSF)₂X, where X=ClO₄, PF₆, and AsF₆ in pulsed magnetic fields to 51 T. Of particular importance is the observation of a new magnetoresistance oscillation for X=ClO₄ in its quenched state. In the absence of any Fermi-surface reconstruction due to anion order at low temperatures, all three materials exhibit nonmonotonic temperature dependence of the oscillation amplitude in the spin-density-wave (SDW) state. We discuss a model where, below a characteristic temperature T* within the SDW state, a magnetic breakdown gap opens.
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Brooks et al. (1999) studied this question.
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