Two-gap s± -wave superconductivity at an oxide interface

After half a century of debate, superconductivity in doped SrTiO3 has come to the fore again with the discovery of interfacial superconductivity in the LaAlO3 /SrTiO3 heterostructures. While these interfaces share the interesting properties of bulk SrTiO3, quantum confinement generates a complex ban...

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Autores: Singh, Gyanendra, Venditti, G., Saiz, Guilhem, Herranz, Gervasi, Sánchez Barrera, Florencio, Jouan, Alexis, Feuillet-Palma, Chéryl, Lesueur, Jerome, Grilli, Marco, Caprara, Sergio, Bergeal, ‪Nicolas
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/269656
Acceso en línea:http://hdl.handle.net/10261/269656
https://api.elsevier.com/content/abstract/scopus_id/85126045148
Access Level:acceso abierto
Palabra clave:Impurities in superconductors
Multiband superconductivity
Superconducting gap
Superconducting phase transition
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spelling Two-gap s± -wave superconductivity at an oxide interfaceSingh, GyanendraVenditti, G.Saiz, GuilhemHerranz, GervasiSánchez Barrera, FlorencioJouan, AlexisFeuillet-Palma, ChérylLesueur, JeromeGrilli, MarcoCaprara, SergioBergeal, ‪NicolasImpurities in superconductorsMultiband superconductivitySuperconducting gapSuperconducting phase transitionAfter half a century of debate, superconductivity in doped SrTiO3 has come to the fore again with the discovery of interfacial superconductivity in the LaAlO3 /SrTiO3 heterostructures. While these interfaces share the interesting properties of bulk SrTiO3, quantum confinement generates a complex band structure involving bands with different orbital symmetries whose occupancy is tunable by electrostating doping. Multigap superconductivity has been predicted to emerge in LaAlO3 /SrTiO3 at large doping, with a Bose-Einstein condensation character at the Lifshtiz transition. In this article, we report on the measurement of the upper critical magnetic field Hc2 of superconducting (110)-oriented LaAlO3 /SrTiO3 heterostructures and evidence a two-gap superconducting regime at high doping. Our results are quantitatively explained by a theoretical model based on the formation of an unconventional s±-wave superconducting state with a repulsive coupling between the two condensates.This work was supported by the ANR PRC (QUANTOP), by the QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement No. 731473) implemented within the European Union’s Horizon 2020 Program (QUANTOX) and the Île de France SESAME program, by the PID2020-118479RB-I00, PID2020-112548RB-100 and Severo Ochoa FUNFUTURE (CEX2019-000917-S) projects of the Spanish Ministry of Science and Innovation (MCIN/AEI/10.13039/501100011033), by the Generalitat de Catalunya (2017 SGR 1377), by Sapienza Università di Roma, through the projects, Ateneo 2018 (Grant No. RM11816431DBA5AF), Ateneo 2019 (Grant No. RM11916B56802AFE), Ateneo 2020 (Grant No. RM120172A8CC7CC7), and by the Italian Ministero dell’Istruzione, dell’Università e della Ricerca, through the Project No. PRIN 2017Z8TS5B. G.S. acknowledges financial support from the Beatriu de Pinós Programme and the Ministry of Research and Universities of the Government of Catalonia, with research Grant No. 2019 BP 00207.With funding from the Spanish government through the ‘Severo Ochoa Centre of Excellence’ accreditation (CEX2019-000917-S).Peer reviewedAmerican Physical SocietyAgence Nationale de la Recherche (France)European CommissionFédération Île de France de Recherche en EnvironnementMinisterio de Ciencia, Innovación y Universidades (España)Generalitat de CatalunyaSapienza Università di RomaMinistero dell'Istruzione, dell'Università e della RicercaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202220222022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/269656https://api.elsevier.com/content/abstract/scopus_id/85126045148reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/731473info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-118479RB-I00info:eu-repo/grantAgreement/MICIU/Plan Estatal de investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112548RB-100info:eu-repo/grantAgreement/MICIU/Plan Estatal de investigación Científica y Técnica y de Innovación 2017-2020/CEX2019-000917-SPhysical Review Bhttp://dx.doi.org/10.1103/PhysRevB.105.064512Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2696562026-05-22T06:33:51Z
dc.title.none.fl_str_mv Two-gap s± -wave superconductivity at an oxide interface
title Two-gap s± -wave superconductivity at an oxide interface
spellingShingle Two-gap s± -wave superconductivity at an oxide interface
Singh, Gyanendra
Impurities in superconductors
Multiband superconductivity
Superconducting gap
Superconducting phase transition
title_short Two-gap s± -wave superconductivity at an oxide interface
title_full Two-gap s± -wave superconductivity at an oxide interface
title_fullStr Two-gap s± -wave superconductivity at an oxide interface
title_full_unstemmed Two-gap s± -wave superconductivity at an oxide interface
title_sort Two-gap s± -wave superconductivity at an oxide interface
dc.creator.none.fl_str_mv Singh, Gyanendra
Venditti, G.
Saiz, Guilhem
Herranz, Gervasi
Sánchez Barrera, Florencio
Jouan, Alexis
Feuillet-Palma, Chéryl
Lesueur, Jerome
Grilli, Marco
Caprara, Sergio
Bergeal, ‪Nicolas
author Singh, Gyanendra
author_facet Singh, Gyanendra
Venditti, G.
Saiz, Guilhem
Herranz, Gervasi
Sánchez Barrera, Florencio
Jouan, Alexis
Feuillet-Palma, Chéryl
Lesueur, Jerome
Grilli, Marco
Caprara, Sergio
Bergeal, ‪Nicolas
author_role author
author2 Venditti, G.
Saiz, Guilhem
Herranz, Gervasi
Sánchez Barrera, Florencio
Jouan, Alexis
Feuillet-Palma, Chéryl
Lesueur, Jerome
Grilli, Marco
Caprara, Sergio
Bergeal, ‪Nicolas
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Agence Nationale de la Recherche (France)
European Commission
Fédération Île de France de Recherche en Environnement
Ministerio de Ciencia, Innovación y Universidades (España)
Generalitat de Catalunya
Sapienza Università di Roma
Ministero dell'Istruzione, dell'Università e della Ricerca
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Impurities in superconductors
Multiband superconductivity
Superconducting gap
Superconducting phase transition
topic Impurities in superconductors
Multiband superconductivity
Superconducting gap
Superconducting phase transition
description After half a century of debate, superconductivity in doped SrTiO3 has come to the fore again with the discovery of interfacial superconductivity in the LaAlO3 /SrTiO3 heterostructures. While these interfaces share the interesting properties of bulk SrTiO3, quantum confinement generates a complex band structure involving bands with different orbital symmetries whose occupancy is tunable by electrostating doping. Multigap superconductivity has been predicted to emerge in LaAlO3 /SrTiO3 at large doping, with a Bose-Einstein condensation character at the Lifshtiz transition. In this article, we report on the measurement of the upper critical magnetic field Hc2 of superconducting (110)-oriented LaAlO3 /SrTiO3 heterostructures and evidence a two-gap superconducting regime at high doping. Our results are quantitatively explained by a theoretical model based on the formation of an unconventional s±-wave superconducting state with a repulsive coupling between the two condensates.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/269656
https://api.elsevier.com/content/abstract/scopus_id/85126045148
url http://hdl.handle.net/10261/269656
https://api.elsevier.com/content/abstract/scopus_id/85126045148
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
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info:eu-repo/grantAgreement/EC/H2020/731473
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-118479RB-I00
info:eu-repo/grantAgreement/MICIU/Plan Estatal de investigación Científica y Técnica y de Innovación 2017-2020/PID2020-112548RB-100
info:eu-repo/grantAgreement/MICIU/Plan Estatal de investigación Científica y Técnica y de Innovación 2017-2020/CEX2019-000917-S
Physical Review B
http://dx.doi.org/10.1103/PhysRevB.105.064512
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
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