Evidence of Collective Charge Behavior in the Insulating State of Ultrathin Films of Superconducting Metals

Details Evidence of Collective Charge Behavior in the Insulating State of Ultrathin Films of Superconducting Metals Evidence of Collective Charge Behavior in the Insulating State of Ultrathin Films of Superconducting Metals

2001-08-20

arxiv.org/abs/cond-mat/0108315v1

Physics

Condensed Matter

Superconductivity

4 pages text, 3 figures

Scientific paper

10.1103/PhysRevLett.88.037004

Nonlinear I-V characteristics have been observed in insulating quench-condensed films which are locally superconducting. We suggest an interpretation in terms of the enhancement of conduction by the depinning of a Cooper pair charge density wave, Cooper pair crystal, or Cooper pair glass that may characterize the insulating regime of locally superconducting films. We propose that this is a more likely description than the Coulomb blockade or charge-anticharge unbinding phenomena.

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