Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor

Details Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor

2000-06-02

arxiv.org/abs/cond-mat/0006039v1

Physics

Condensed Matter

Superconductivity

4 page Letter with 3 figures (2 color figures)

Scientific paper

10.1209/epl/i2001-00232-4

Using high speed scanning tunneling spectroscopy, we perform a full mapping of the quasiparticle density of states (DOS) in single crystals of BiPbSrCaCuO(2212). The measurements carried out at 5 K showed a complex spatial pattern of important variations of the local DOS on the nanometer scale. Superconducting areas are co-existing with regions of a smooth and larger gap-like DOS structure. The superconducting regions are found to have a minimum size of about 3 nm. The role of Pb-introduced substitutional disorder in the observed spatial variations of the local DOS is discussed.

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