Reentrant Phase Coherence in Superconducting Nanowire Composites
| Autor: | Christos Panagopoulos, Patrick Gougeon, Diala Salloum, Moritz Hoesch, Alexander Paul Petrović, Diane Ansermet, Michel Potel, Dmitri Chernyshov, Lilia Boeri, Shikun He, Ole Krogh Andersen |
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| Přispěvatelé: | Nanyang Technological University [Singapour], European Synchrotron Radiation Facility (ESRF), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), NRF-CRP4-2008-04, National Research Foundation-Prime Minister's office, Republic of Singapore, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Superconducting coherence length
Materials science Nanowire General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 01 natural sciences Superconductivity (cond-mat.supr-con) Vacancy defect Condensed Matter::Superconductivity 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) [CHIM]Chemical Sciences General Materials Science Composite material 010306 general physics Superconductivity Condensed Matter - Materials Science Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics superconductivity Condensed Matter - Superconductivity General Engineering Nanofilaments quasi-one-dimensional reentrance Materials Science (all) Engineering (all) Physics and Astronomy (all) Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology nanofilaments Magnetic field Transverse plane Reentrancy 0210 nano-technology Coherence (physics) |
| Zdroj: | ACS Nano ACS Nano, American Chemical Society, 2016, 10 (1), pp.515-523. ⟨10.1021/acsnano.5b05450⟩ ACS Nano, 2016, 10 (1), pp.515-523. ⟨10.1021/acsnano.5b05450⟩ |
| ISSN: | 1936-0851 |
| DOI: | 10.1021/acsnano.5b05450⟩ |
| Popis: | The short coherence lengths characteristic of low-dimensional superconductors are associated with usefully high critical fields or temperatures. Unfortunately, such materials are often sensitive to disorder and suffer from phase fluctuations in the superconducting order parameter which diverge with temperature $T$, magnetic field $H$ or current $I$. We propose an approach to overcome synthesis and fluctuation problems: building superconductors from inhomogeneous composites of nanofilaments. Macroscopic crystals of quasi-one-dimensional Na$_{2-\delta}$Mo$_6$Se$_6$ featuring Na vacancy disorder ($\delta\approx$~0.2) are shown to behave as percolative networks of superconducting nanowires. Long range order is established via transverse coupling between individual one-dimensional filaments, yet phase coherence remains unstable to fluctuations and localization in the zero-($T$,$H$,$I$) limit. However, a region of reentrant phase coherence develops upon raising ($T$,$H$,$I$). We attribute this phenomenon to an enhancement of the transverse coupling due to electron delocalization. Our observations of reentrant phase coherence coincide with a peak in the Josephson energy $E_J$ at non-zero ($T$,$H$,$I$), which we estimate using a simple analytical model for a disordered anisotropic superconductor. Na$_{2-\delta}$Mo$_6$Se$_6$ is therefore a blueprint for a future generation of nanofilamentary superconductors with inbuilt resilience to phase fluctuations at elevated ($T$,$H$,$I$). Comment: 40 pages including Supporting Information, 5 figures. This document is the unedited Author's version of a Submitted Work that was subsequently accepted for publication in ACS Nano, copyright \copyright American Chemical Society after peer review |
| Databáze: | OpenAIRE |
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