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

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arxiv cond-mat/0006039 v1 pith:YUGHW623 submitted 2000-06-02 cond-mat.supr-con

T. Cren , D. Roditchev , W. Sacks , J. Klein This is my paper · ORCID
classification cond-mat.supr-con
keywords densitylocalmappingnanometerregionsscalespatialstates
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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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