Fluctuation Effects in High Sheet Resistance Superconducting Films

Details Fluctuation Effects in High Sheet Resistance Superconducting Films Fluctuation Effects in High Sheet Resistance Superconducting Films

2000-10-06

arxiv.org/abs/cond-mat/0010114v1

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, 5 figures

Scientific paper

10.1070/1063-7869/44/10S/S23

As the normal state sheet resistance, $R_n$, of a thin film superconductor increases, its superconducting properties degrade. For $R_n\simeq h/4e^2$ superconductivity disappears and a transition to a nonsuperconducting state occurs. We present electron tunneling and transport measurements on ultrathin, homogeneously disordered superconducting films in the vicinity of this transition. The data provide strong evidence that fluctuations in the amplitude of the superconducting order parameter dominate the tunneling density of states and the resistive transitions in this regime. We briefly discuss possible sources of these amplitude fluctuation effects. We also describe how the data suggest a novel picture of the superconductor to nonsuperconductor transition in homogeneous 2D systems.

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