Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process

Binary Iron selenide (FeSe) thin films have been widely studied for years to unveil the high temperature superconductivity in iron-based superconductors. However, the origin of superconducting transition in this unconventional system is still under debate and worth deep investigations. In the presen...

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Autores principales:	Zhiqiang Cao, Longqing Chen, Zhenxiang Cheng, Wenbin Qiu
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	thin film iron-based superconductor pulsed laser deposition transmission electron microscopy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/825895bf41014c2fa2b4b46c6f47f18b
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spelling	oai:doaj.org-article:825895bf41014c2fa2b4b46c6f47f18b2021-11-11T17:57:43ZInduced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process10.3390/ma142163831996-1944https://doaj.org/article/825895bf41014c2fa2b4b46c6f47f18b2021-10-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/21/6383https://doaj.org/toc/1996-1944Binary Iron selenide (FeSe) thin films have been widely studied for years to unveil the high temperature superconductivity in iron-based superconductors. However, the origin of superconducting transition in this unconventional system is still under debate and worth deep investigations. In the present work, the transition from insulator to superconductor was achieved in non-superconducting FeSe ultrathin films (~8 nm) grown on calcium fluoride substrates via a simple in-situ Mg-coating by a pulsed laser deposition technique. The Mg-coated FeSe film with an optimized amount of Mg exhibited a superconducting critical temperature as 9.7 K and an upper critical field as 30.9 T. Through systematic characterizations on phase identification, carrier transport behavior and high-resolution microstructural features, the revival of superconductivity in FeSe ultrathin films is mostly attributed to the highly crystallized FeSe and extra electron doping received from external Mg-coating process. Although the top few FeSe layers are incorporated with Mg, most FeSe layers are intact and protected by a stable magnesium oxide layer. This work provides a new strategy to induce superconductivity in FeSe films with non-superconducting behavior, which might contribute to a more comprehensive understanding of iron-based superconductivity and the benefit to downstream applications such as magnetic resonance imaging, high-field magnets and electrical cables.Zhiqiang CaoLongqing ChenZhenxiang ChengWenbin QiuMDPI AGarticlethin filmiron-based superconductorpulsed laser depositiontransmission electron microscopyTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 6383, p 6383 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	thin film iron-based superconductor pulsed laser deposition transmission electron microscopy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	thin film iron-based superconductor pulsed laser deposition transmission electron microscopy Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Zhiqiang Cao Longqing Chen Zhenxiang Cheng Wenbin Qiu Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process
description	Binary Iron selenide (FeSe) thin films have been widely studied for years to unveil the high temperature superconductivity in iron-based superconductors. However, the origin of superconducting transition in this unconventional system is still under debate and worth deep investigations. In the present work, the transition from insulator to superconductor was achieved in non-superconducting FeSe ultrathin films (~8 nm) grown on calcium fluoride substrates via a simple in-situ Mg-coating by a pulsed laser deposition technique. The Mg-coated FeSe film with an optimized amount of Mg exhibited a superconducting critical temperature as 9.7 K and an upper critical field as 30.9 T. Through systematic characterizations on phase identification, carrier transport behavior and high-resolution microstructural features, the revival of superconductivity in FeSe ultrathin films is mostly attributed to the highly crystallized FeSe and extra electron doping received from external Mg-coating process. Although the top few FeSe layers are incorporated with Mg, most FeSe layers are intact and protected by a stable magnesium oxide layer. This work provides a new strategy to induce superconductivity in FeSe films with non-superconducting behavior, which might contribute to a more comprehensive understanding of iron-based superconductivity and the benefit to downstream applications such as magnetic resonance imaging, high-field magnets and electrical cables.
format	article
author	Zhiqiang Cao Longqing Chen Zhenxiang Cheng Wenbin Qiu
author_facet	Zhiqiang Cao Longqing Chen Zhenxiang Cheng Wenbin Qiu
author_sort	Zhiqiang Cao
title	Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process
title_short	Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process
title_full	Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process
title_fullStr	Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process
title_full_unstemmed	Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process
title_sort	induced superconducting transition in ultra-thin iron-selenide films by a mg-coating process
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/825895bf41014c2fa2b4b46c6f47f18b
work_keys_str_mv	AT zhiqiangcao inducedsuperconductingtransitioninultrathinironselenidefilmsbyamgcoatingprocess AT longqingchen inducedsuperconductingtransitioninultrathinironselenidefilmsbyamgcoatingprocess AT zhenxiangcheng inducedsuperconductingtransitioninultrathinironselenidefilmsbyamgcoatingprocess AT wenbinqiu inducedsuperconductingtransitioninultrathinironselenidefilmsbyamgcoatingprocess
_version_	1718431953950081024

Induced Superconducting Transition in Ultra-Thin Iron-Selenide Films by a Mg-Coating Process

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