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

T. Cren·D. Roditchev·W. Sacks·J. Klein
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Abstract

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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T. Cren, D. Roditchev, W. Sacks, J. Klein. 2000-06-02. Nanometer Scale Mapping of the Density of States in an Inhomogeneous Superconductor. https://doi.org/10.1209/epl%2Fi2001-00232-4

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