Critical current in charge-density wave transport
Sinchenko, A. A. · Pokrovski, V. Ya. · Zybtsev, S. G. · Gorlova, I. G. · Latyshev, Yu. I. · Monceau, P.
Original · EN
We report transport measurements under very high current densities j, up to 10⁸ A/cm², of quasi-one-dimensional charge-density wave (CDW) conductors NbSe₃ and TaS₃. Joule heating has been minimized by using a point-contact configuration or by measuring samples with extremely small cross-sections. Above jc ≈ 10⁷ A/cm² we find evidence for suppression of the Peierls gap and development of the metallic state. The critical CDW velocity corresponding with j₀ is comparable with the sound velocity, and with Δ/ ℏ kF (kF is the Fermi wave vector), which corresponds to the depairing current. Possible scenarios of the Peierls state destruction are discussed.
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