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Dielectric breakdown of one-dimensional Mott insulators Sr 2 CuO 3 and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="…

2000; American Physical Society; Volume: 62; Issue: 11 Linguagem: Inglês

10.1103/physrevb.62.7015

1095-3795

Y. Taguchi, Tomotaka Matsumoto, Y. Tokura,

Electronic and Structural Properties of Oxides

Dielectric breakdown phenomena accompanied by characteristic time delay and subsequent negative differential resistance effect have been observed for typical one-dimensional (1D) Mott insulators, ${\mathrm{Sr}}_{2}{\mathrm{CuO}}_{3}$ and ${\mathrm{SrCuO}}_{2}.$ In the both compounds, the threshold electric-field for the breakdown, defined as a field above which the differential resistance becomes negative, has been found to increase exponentially with decreasing temperature. This result is similar to the case of charge-density-wave depinning, and indicates the collective nature of charge dynamics in these 1D systems. The electric-field dependence of the delay time is analyzed in terms of a phenomenological model.