Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions

Conventional superconductivity is incompatible with ferromagnetism, because the magnetic exchange field tends to spin-polarize electrons and breaks apart the opposite-spin singlet Cooper pairs(1). Yet, the possibility of a long-range penetration of superconducting correlations into strong ferromagne...

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Autores: Visani, Cristina, Sefrioui Khamali, Zouhair, Tornos Castillo, Javier, Villegas Hernández, Javier Eulogio, León Yebra, Carlos, Briatico, J., Bibes, Manuel, Barthelemy, Agnes, Santamaría Sánchez-Barriga, Jacobo
Tipo de recurso: artículo
Fecha de publicación:2012
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/97161
Acceso en línea:https://hdl.handle.net/20.500.14352/97161
Access Level:acceso abierto
Palabra clave:538.9
Física del estado sólido
2211 Física del Estado Sólido
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spelling Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctionsVisani, CristinaSefrioui Khamali, ZouhairTornos Castillo, JavierVillegas Hernández, Javier EulogioLeón Yebra, CarlosBriatico, J.Bibes, ManuelBarthelemy, AgnesSantamaría Sánchez-Barriga, Jacobo538.9Física del estado sólido2211 Física del Estado SólidoConventional superconductivity is incompatible with ferromagnetism, because the magnetic exchange field tends to spin-polarize electrons and breaks apart the opposite-spin singlet Cooper pairs(1). Yet, the possibility of a long-range penetration of superconducting correlations into strong ferromagnets has been evinced by experiments that found Josephson coupling between superconducting electrodes separated afar by a ferromagnetic spacer(2-7). This is considered a proof of the emergence at the superconductor/ferromagnetic (S/F) interfaces of equal-spin triplet pairing, which is immune to the exchange field and can therefore propagate over long distances into the F (ref. 8). This effect bears much fundamental interest and potential for spintronic applications(9). However, a spectroscopic signature of the underlying microscopic mechanisms has remained elusive. Here we do show this type of evidence, notably in a S/F system for which the possible appearance of equal-spin triplet pairing is controversial(10-12): heterostructures that combine a half-metallic F (La0.7Ca0.3MnO3) with a d-wave S (YBa2Cu3O7). We found quasiparticle and electron interference effects in the conductance across the S/F interfaces that directly demonstrate the long-range propagation across La0.7Ca0.3MnO3 of superconducting correlations, and imply the occurrence of unconventional equal-spin Andreev reflection. This allows for an understanding of the unusual proximity behaviour observed in this type of heterostructures(12,13).Nature ResearchUniversidad Complutense de Madrid20122012-05-1320122012-05-13journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/97161reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)InglésengMAT2011-27470 Not available Not availableCSD2009-00013 Not available Not availableComunidad de Madrid http://dx.doi.org/10.13039/100012818 S2009-MAT1756 Not availableopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/971612026-06-02T12:44:21Z
dc.title.none.fl_str_mv Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
title Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
spellingShingle Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
Visani, Cristina
538.9
Física del estado sólido
2211 Física del Estado Sólido
title_short Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
title_full Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
title_fullStr Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
title_full_unstemmed Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
title_sort Equal-spin Andreev reflection and long range coherent transport in hightemperature superconductor/half-metallic ferromagnet junctions
dc.creator.none.fl_str_mv Visani, Cristina
Sefrioui Khamali, Zouhair
Tornos Castillo, Javier
Villegas Hernández, Javier Eulogio
León Yebra, Carlos
Briatico, J.
Bibes, Manuel
Barthelemy, Agnes
Santamaría Sánchez-Barriga, Jacobo
author Visani, Cristina
author_facet Visani, Cristina
Sefrioui Khamali, Zouhair
Tornos Castillo, Javier
Villegas Hernández, Javier Eulogio
León Yebra, Carlos
Briatico, J.
Bibes, Manuel
Barthelemy, Agnes
Santamaría Sánchez-Barriga, Jacobo
author_role author
author2 Sefrioui Khamali, Zouhair
Tornos Castillo, Javier
Villegas Hernández, Javier Eulogio
León Yebra, Carlos
Briatico, J.
Bibes, Manuel
Barthelemy, Agnes
Santamaría Sánchez-Barriga, Jacobo
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 538.9
Física del estado sólido
2211 Física del Estado Sólido
topic 538.9
Física del estado sólido
2211 Física del Estado Sólido
description Conventional superconductivity is incompatible with ferromagnetism, because the magnetic exchange field tends to spin-polarize electrons and breaks apart the opposite-spin singlet Cooper pairs(1). Yet, the possibility of a long-range penetration of superconducting correlations into strong ferromagnets has been evinced by experiments that found Josephson coupling between superconducting electrodes separated afar by a ferromagnetic spacer(2-7). This is considered a proof of the emergence at the superconductor/ferromagnetic (S/F) interfaces of equal-spin triplet pairing, which is immune to the exchange field and can therefore propagate over long distances into the F (ref. 8). This effect bears much fundamental interest and potential for spintronic applications(9). However, a spectroscopic signature of the underlying microscopic mechanisms has remained elusive. Here we do show this type of evidence, notably in a S/F system for which the possible appearance of equal-spin triplet pairing is controversial(10-12): heterostructures that combine a half-metallic F (La0.7Ca0.3MnO3) with a d-wave S (YBa2Cu3O7). We found quasiparticle and electron interference effects in the conductance across the S/F interfaces that directly demonstrate the long-range propagation across La0.7Ca0.3MnO3 of superconducting correlations, and imply the occurrence of unconventional equal-spin Andreev reflection. This allows for an understanding of the unusual proximity behaviour observed in this type of heterostructures(12,13).
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-05-13
2012
2012-05-13
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/97161
url https://hdl.handle.net/20.500.14352/97161
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv MAT2011-27470 Not available Not available
CSD2009-00013 Not available Not available
Comunidad de Madrid http://dx.doi.org/10.13039/100012818 S2009-MAT1756 Not available
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Nature Research
publisher.none.fl_str_mv Nature Research
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,298079

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