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19 April 2024 |
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Article overview
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Confinement of superconducting fluctuations due to emergent electronic inhomogeneities | | C. Carbillet
; S. Caprara
; M. Grilli
; C. Brun
; T. Cren
; F. Debontridder
; B. Vignolle
; W. Tabis
; D. Demaille
; L. Largeau
; K. Ilin
; M. Siegel
; D. Roditchev
; B. Leridon
; | | Date: |
31 Jul 2015 | | Abstract: | The microscopic nature of an insulating state in the vicinity of a
superconducting state, in the presence of disorder, is a hotly debated
question. While the simplest scenario proposes that Coulomb interactions
destroy the Cooper pairs at the transition, leading to localization of single
electrons, an alternate possibility supported by experimental observations
suggests that Cooper pairs instead directly localize. The question of the
homogeneity, granularity, or possibly glassiness of the material on the verge
of this transition is intimately related to this fundamental issue. Here, by
combining macroscopic and nano-scale studies of superconducting ultrathin NbN
films, we reveal nanoscopic electronic inhomogeneities that emerge when the
film thickness is reduced. In addition, while thicker films display a purely
two-dimensional behaviour in the superconducting fluctuations, we demonstrate a
zero-dimensional regime for the thinner samples precisely on the scale of the
inhomogeneities. Such behavior is somehow intermediate between the Fermi and
Bose insulator paradigms and calls for further investigation to understand the
way Cooper pairs continuously evolve from a bound state of fermionic objects
into localized bosonic entities. | | Source: | arXiv, 1507.8955 | | Services: | Forum | Review | PDF | Favorites | |
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