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Keywords = superfluid stiffness

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10 pages, 508 KiB  
Article
Finite-Frequency Dissipation in Two-Dimensional Superconductors with Disorder at the Nanoscale
by Giulia Venditti, Ilaria Maccari, Marco Grilli and Sergio Caprara
Nanomaterials 2021, 11(8), 1888; https://doi.org/10.3390/nano11081888 - 23 Jul 2021
Cited by 1 | Viewed by 2431
Abstract
Two-dimensional superconductors with disorder at the nanoscale can host a variety of intriguing phenomena. The superconducting transition is marked by a broad percolative transition with a long tail of the resistivity as function of the temperature. The fragile filamentary superconducting clusters, forming at [...] Read more.
Two-dimensional superconductors with disorder at the nanoscale can host a variety of intriguing phenomena. The superconducting transition is marked by a broad percolative transition with a long tail of the resistivity as function of the temperature. The fragile filamentary superconducting clusters, forming at low temperature, can be strengthened further by proximity effect with the surrounding metallic background, leading to an enhancement of the superfluid stiffness well below the percolative transition. Finite-frequency dissipation effects, e.g., related to the appearance of thermally excited vortices, can also significantly contribute to the resulting physics. Here, we propose a random impedance model to investigate the role of dissipation effects in the formation and strengthening of fragile superconducting clusters, discussing the solution within the effective medium theory. Full article
(This article belongs to the Special Issue Superconductivity in Nanoscaled Systems)
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12 pages, 471 KiB  
Article
Superfluid Properties of Superconductors with Disorder at the Nanoscale: A Random Impedance Model
by Giulia Venditti, Ilaria Maccari, Marco Grilli and Sergio Caprara
Condens. Matter 2020, 5(2), 36; https://doi.org/10.3390/condmat5020036 - 14 May 2020
Cited by 2 | Viewed by 3403
Abstract
Some two-dimensional superconductors like, e.g., LaAlO 3 /SrTiO 3 heterostructures or thin films of transition metal dichalcogenides, display peculiar properties that can be understood in terms of electron inhomogeneity at the nanoscale. In this framework, unusual features of the metal-superconductor transition have been [...] Read more.
Some two-dimensional superconductors like, e.g., LaAlO 3 /SrTiO 3 heterostructures or thin films of transition metal dichalcogenides, display peculiar properties that can be understood in terms of electron inhomogeneity at the nanoscale. In this framework, unusual features of the metal-superconductor transition have been interpreted as due to percolative effects within a network of superconducting regions embedded in a metallic matrix. In this work we use a mean-field-like effective medium approach to investigate the superconducting phase below the critical temperature T c at which the resistivity vanishes. Specifically, we consider the finite frequency impedance of the system to extract the dissipative part of the conductance and the superfluid stiffness in the superconducting state. Intriguing effects arise from the metallic character of the embedding matrix: upon decreasing the temperature below T c proximity effects may rapidly increase the superfluid stiffness. Then, a rather fragile superconducting state, living on a filamentary network just below T c , can be substantially consolidated by additional superconducting regions induced by proximity effect in the interstitial metallic regions. This mean-field prediction should call for further theoretical analyses and trigger experimental investigations of the superconducting properties of the above systems. Full article
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