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Extracting a More Realistic Pseudopotential for Aluminum, Lead, Niobium and Tantalum from Superconductor Electron Tunnelling Spectroscopy Data

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Abstract

Electron tunnelling spectroscopy when first developed was used to extract the electron-phonon spectral density, α 2 F(ν), from superconductive metals. Here, on revisiting the topic, we show that it further allows the direct extraction of more realistic pseudopotentials for such metals. The pseudopotential so extracted has a range of surprising but physically reasonable properties and regenerates the experimentally derived α 2 F(ν) accurately. Freed from most of its long-standing uncertainties, this pseudopotential may find wide application.

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Authors and Affiliations

  1. Department of Pure and Applied Physics, Queen’s University of Belfast, Belfast, BT7 1NN, N. Ireland, UK

    X. H. Zheng & D. G. Walmsley

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  1. X. H. Zheng
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  2. D. G. Walmsley
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Correspondence to D. G. Walmsley.

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Zheng, X.H., Walmsley, D.G. Extracting a More Realistic Pseudopotential for Aluminum, Lead, Niobium and Tantalum from Superconductor Electron Tunnelling Spectroscopy Data. J Low Temp Phys 166, 279–297 (2012). https://doi.org/10.1007/s10909-011-0446-x

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