Pseudogap in a thin film of a conventional superconductor

Details Pseudogap in a thin film of a conventional superconductor Pseudogap in a thin film of a conventional superconductor

2009-06-05

arxiv.org/abs/0906.1193v2

Nature Communications, 1:140 (2010)

Physics

Condensed Matter

Superconductivity

26 pages, 4 figures

Scientific paper

10.1038/ncomms1140

A superconducting state is characterized by the gap in the electronic density of states which vanishes at the superconducting transition temperature Tc. It was discovered that in high temperature superconductors a noticeable depression in the density of states still remains even at temperatures above Tc; this feature being called pseudogap. Here we show that a pseudogap exists in a conventional superconductor: ultrathin titanium nitride films over a wide range of temperatures above Tc. Our study reveals that this pseudogap state is induced by superconducting fluctuations and favored by two-dimensionality and by the proximity to the transition to the insulating state. A general character of the observed phenomenon provides a powerful tool to discriminate between fluctuations as the origin of the pseudogap state, and other contributions in the layered high temperature superconductor compounds.

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