Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites

Abstract Many experiments investigating magnetic-field tuned superconductor-insulator transition (H-SIT) often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a ‘failed superconductor’, thus challenging conventional theory. Here we stu...

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Autores principales:	Xinyang Zhang, Bar Hen, Alexander Palevski, Aharon Kapitulnik
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
Acceso en línea:	https://doaj.org/article/c956b44055ce4f58aee3dfb7a06cd31f
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spelling	oai:doaj.org-article:c956b44055ce4f58aee3dfb7a06cd31f2021-12-02T17:04:52ZRobust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites10.1038/s41535-021-00329-22397-4648https://doaj.org/article/c956b44055ce4f58aee3dfb7a06cd31f2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41535-021-00329-2https://doaj.org/toc/2397-4648Abstract Many experiments investigating magnetic-field tuned superconductor-insulator transition (H-SIT) often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a ‘failed superconductor’, thus challenging conventional theory. Here we study a random granular array of indium islands grown on a gateable layer of indium-oxide. By tuning the intergrain couplings, we reveal a wide range of magnetic fields where resistance saturation is observed, under conditions of careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation is shown to strengthen the tendency of superconductivity, where at low field a global superconducting phase is restored. Increasing magnetic field unveils an ‘avoided H-SIT’ that exhibits granularity-induced logarithmic divergence of the resistance/conductance above/below that transition, pointing to possible vestiges of the original emergent duality observed in a true H-SIT. We conclude that anomalous metallic phase is intimately associated with inherent inhomogeneities, exhibiting robust behavior at attainable temperatures for strongly granular two-dimensional systems.Xinyang ZhangBar HenAlexander PalevskiAharon KapitulnikNature PortfolioarticleMaterials of engineering and construction. Mechanics of materialsTA401-492Atomic physics. Constitution and properties of matterQC170-197ENnpj Quantum Materials, Vol 6, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197
spellingShingle	Materials of engineering and construction. Mechanics of materials TA401-492 Atomic physics. Constitution and properties of matter QC170-197 Xinyang Zhang Bar Hen Alexander Palevski Aharon Kapitulnik Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites
description	Abstract Many experiments investigating magnetic-field tuned superconductor-insulator transition (H-SIT) often exhibit low-temperature resistance saturation, which is interpreted as an anomalous metallic phase emerging from a ‘failed superconductor’, thus challenging conventional theory. Here we study a random granular array of indium islands grown on a gateable layer of indium-oxide. By tuning the intergrain couplings, we reveal a wide range of magnetic fields where resistance saturation is observed, under conditions of careful electromagnetic filtering and within a wide range of linear response. Exposure to external broadband noise or microwave radiation is shown to strengthen the tendency of superconductivity, where at low field a global superconducting phase is restored. Increasing magnetic field unveils an ‘avoided H-SIT’ that exhibits granularity-induced logarithmic divergence of the resistance/conductance above/below that transition, pointing to possible vestiges of the original emergent duality observed in a true H-SIT. We conclude that anomalous metallic phase is intimately associated with inherent inhomogeneities, exhibiting robust behavior at attainable temperatures for strongly granular two-dimensional systems.
format	article
author	Xinyang Zhang Bar Hen Alexander Palevski Aharon Kapitulnik
author_facet	Xinyang Zhang Bar Hen Alexander Palevski Aharon Kapitulnik
author_sort	Xinyang Zhang
title	Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites
title_short	Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites
title_full	Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites
title_fullStr	Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites
title_full_unstemmed	Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites
title_sort	robust anomalous metallic states and vestiges of self-duality in two-dimensional granular in-ino x composites
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/c956b44055ce4f58aee3dfb7a06cd31f
work_keys_str_mv	AT xinyangzhang robustanomalousmetallicstatesandvestigesofselfdualityintwodimensionalgranularininoxcomposites AT barhen robustanomalousmetallicstatesandvestigesofselfdualityintwodimensionalgranularininoxcomposites AT alexanderpalevski robustanomalousmetallicstatesandvestigesofselfdualityintwodimensionalgranularininoxcomposites AT aharonkapitulnik robustanomalousmetallicstatesandvestigesofselfdualityintwodimensionalgranularininoxcomposites
_version_	1718381817292128256

Robust anomalous metallic states and vestiges of self-duality in two-dimensional granular In-InO x composites

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