Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures

The discovery of two-dimensional superconductivity in Bi2Te3/FeTe heterostructures provides a new platform for the search of Majorana fermions in condensed matter systems. Since Majorana fermions are expected to reside at the core of the vortices, a close examination of the vortex dynamics in superc...

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Main Authors:	Liu, Hong-Chao, Li, Hui, He, Qing Lin, Sou, Iam Keong, Goh, Swee K., Wang, Jiannong
Format:	Online
Language:	English
Published:	Nature Publishing Group 2016
Online Access:	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4868974/

id	pubmed-4868974
recordtype	oai_dc
spelling	pubmed-48689742016-05-31 Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures Liu, Hong-Chao Li, Hui He, Qing Lin Sou, Iam Keong Goh, Swee K. Wang, Jiannong Article The discovery of two-dimensional superconductivity in Bi2Te3/FeTe heterostructures provides a new platform for the search of Majorana fermions in condensed matter systems. Since Majorana fermions are expected to reside at the core of the vortices, a close examination of the vortex dynamics in superconducting interface is of paramount importance. Here, we report the robustness of the interfacial superconductivity and 2D vortex dynamics in four as-grown and aged Bi2Te3/FeTe heterostructure with different Bi2Te3 epilayer thickness (3, 5, 7, 14 nm). After two years’ air exposure, superconductivity remains robust even when the thickness of Bi2Te3 epilayer is down to 3 nm. Meanwhile, a new feature at ~13 K is induced in the aged samples, and the high field studies reveal its relevance to superconductivity. The resistance of all as-grown and aged heterostructures, just below the superconducting transition temperature follows the Arrhenius relation, indicating the thermally activated flux flow behavior at the interface of Bi2Te3 and FeTe. Moreover, the activation energy exhibits a logarithmic dependence on the magnetic field, providing a compelling evidence for the 2D vortex dynamics in this novel system. The weak disorder associated with aging-induced Te vacancies is possibly responsible for these observed phenomena. Nature Publishing Group 2016-05-17 /pmc/articles/PMC4868974/ /pubmed/27185305 http://dx.doi.org/10.1038/srep26168 Text en Copyright © 2016, Macmillan Publishers Limited http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
repository_type	Open Access Journal
institution_category	Foreign Institution
institution	US National Center for Biotechnology Information
building	NCBI PubMed
collection	Online Access
language	English
format	Online
author	Liu, Hong-Chao Li, Hui He, Qing Lin Sou, Iam Keong Goh, Swee K. Wang, Jiannong
spellingShingle	Liu, Hong-Chao Li, Hui He, Qing Lin Sou, Iam Keong Goh, Swee K. Wang, Jiannong Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
author_facet	Liu, Hong-Chao Li, Hui He, Qing Lin Sou, Iam Keong Goh, Swee K. Wang, Jiannong
author_sort	Liu, Hong-Chao
title	Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
title_short	Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
title_full	Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
title_fullStr	Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
title_full_unstemmed	Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures
title_sort	robust two-dimensional superconductivity and vortex system in bi2te3/fete heterostructures
description	The discovery of two-dimensional superconductivity in Bi2Te3/FeTe heterostructures provides a new platform for the search of Majorana fermions in condensed matter systems. Since Majorana fermions are expected to reside at the core of the vortices, a close examination of the vortex dynamics in superconducting interface is of paramount importance. Here, we report the robustness of the interfacial superconductivity and 2D vortex dynamics in four as-grown and aged Bi2Te3/FeTe heterostructure with different Bi2Te3 epilayer thickness (3, 5, 7, 14 nm). After two years’ air exposure, superconductivity remains robust even when the thickness of Bi2Te3 epilayer is down to 3 nm. Meanwhile, a new feature at ~13 K is induced in the aged samples, and the high field studies reveal its relevance to superconductivity. The resistance of all as-grown and aged heterostructures, just below the superconducting transition temperature follows the Arrhenius relation, indicating the thermally activated flux flow behavior at the interface of Bi2Te3 and FeTe. Moreover, the activation energy exhibits a logarithmic dependence on the magnetic field, providing a compelling evidence for the 2D vortex dynamics in this novel system. The weak disorder associated with aging-induced Te vacancies is possibly responsible for these observed phenomena.
publisher	Nature Publishing Group
publishDate	2016
url	https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4868974/
_version_	1613580000246628352

Robust two-dimensional superconductivity and vortex system in Bi2Te3/FeTe heterostructures

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