Critical current in charge-density wave transport

Details Critical current in charge-density wave transport Critical current in charge-density wave transport

2001-01-10

arxiv.org/abs/cond-mat/0101124v1

Physics

Condensed Matter

Strongly Correlated Electrons

5pages, 5 figures

Scientific paper

We report transport measurements under very high current densities $j$, up to $\sim10^8$~A/cm$^2$, of quasi-one-dimensional charge-density wave (CDW) conductors NbSe$_3$ and TaS$_3$. Joule heating has been minimized by using a point-contact configuration or by measuring samples with extremely small cross-sections. Above $j_c \approx 10^7$~A/cm$^2$ we find evidence for suppression of the Peierls gap and development of the metallic state. The critical CDW velocity corresponding with $j_0$ is comparable with the sound velocity, and with $\Delta/ \hbar k_F$ ($k_F$ is the Fermi wave vector), which corresponds to the depairing current. Possible scenarios of the Peierls state destruction are discussed.

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