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Electronic Structure and Properties of Superconducting Materials with Simple Fermi Surfaces

Jarlborg, T.

In: Journal of Superconductivity and Novel Magnetism, 2015, vol. 28, no. 4, p. 1231-1236

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    Titre
    • Electronic Structure and Properties of Superconducting Materials with Simple Fermi Surfaces
    Auteur
    • Jarlborg, T.. DPMC, University of Geneva, 24 Quai Ernest-Ansermet, 1211, Geneva 4, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Journal of Superconductivity and Novel Magnetism, 2015, vol. 28, no. 4, p. 1231-1236. Springer US; http://www.springer-ny.com
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331655
    Summary
    The electronic structures of the ground state for several different superconducting materials, such as cuprates, conventional 3-dimensional superconductors, doped semiconductors, and low-dimensional systems, are quite different and sometimes in contrast to what supposed to make a superconductor. Properties like the Femathrmi-surface (FS) topology, density of states (DOS), stripes, electron-phonon coupling (λ ep), and spin fluctuations (λ sf) are analyzed in order to find clues to what might be important for the mechanism of superconductivity. A high DOS at E F is important for standard estimates of λ ′ s, but it is suggested that superconductivity can survive a low DOS if the FS is simple enough. Superconducting fluctuations are plausible from coupling to long-wavelength modes in underdoped cuprates, where short coherence length is a probable obstacle for long-range superconductivity. Themathrmal disorder is recognized as a limiting factor for large T C independently of doping.