Current dependent fluctuations in a Bi$_2$Sr$_2$CuO$_{6+δ}$ thin film

Details Current dependent fluctuations in a Bi$_2$Sr$_2$CuO$_{6+δ}$ thin film Current dependent fluctuations in a Bi$_2$Sr$_2$CuO$_{6+δ}$ thin film

2005-05-11

arxiv.org/abs/cond-mat/0505271v1

Eur. Phys. J. B 46, 215 (2005)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1140/epjb/e2005-00224-2

The current dependence of the excess conductivity is measured up to $\simeq 3 T_c$ for a Bi$_2$Sr$_2$CuO$_{6+\delta}$ thin film, as a function of doping. It is found to be anomalously sensitive to the transport current and to behave as a universal function of $T/T_c$ in the whole doping range. We discuss these results in the perspective of a granular superconductor with a gapless-like behavior.

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